feat(cutover): hard legacy cutover — drop projects/stacks/sites/deploys

The clean-break delete that closes the workload-first refactor arc.
Net diff: ~30 backend files deleted, ~20 modified, ~12k LOC removed
on the Go side; entire /projects /stacks /sites /deploy frontend
trees gone; ~6.7k LOC removed on the Svelte/TypeScript side.

Backend
- API handlers gone: internal/api/{projects,stages,stage_env,stacks,
  static_sites,deploys,instances,volume_browser}.go
- Store CRUD + tests gone: internal/store/{projects,stages,stage_env,
  stacks,static_sites,static_site_secrets,deploys,poll_state,volumes,
  workload_sync}.go (+ _test.go siblings)
- Legacy deployer pipeline gone: internal/deployer/{bluegreen,promote,
  rollback,subdomain,resolver_test}.go; deployer.go trimmed to just the
  dispatch surface used by the plugin pipeline
- internal/staticsite/{manager,healthcheck}.go and
  internal/stack/manager.go gone (the rest of those packages stay as
  helpers imported by the static + compose plugins)
- internal/registry/poller.go gone (legacy registry poller)
- internal/volume.ResolvePath gone; ResolveWorkloadPath stays
- internal/webhook: handleWebhook (project) + handleSiteWebhook (site)
  gone; only POST /api/webhook/triggers/{secret} remains
- workload-side webhook URL handlers (getWorkloadWebhook +
  regenerateWorkloadWebhook + EnsureWorkloadWebhookSecret +
  SetWorkloadWebhookSecret + GetWorkloadByWebhookSecret) gone — they
  minted URLs that would 404 against the new trigger-only ingress
- cmd/server/main.go: dropped staticsite.Manager, stack.Manager,
  staticsite.HealthChecker, registry poller, SetSiteSyncTriggerer,
  SetStaticSiteManager, SetStackManager, wireStaticBackend
- store/store.go: idempotent DROP TABLE IF EXISTS for every legacy
  table (projects, stages, stage_env, volumes, deploys, deploy_logs,
  poll_states, stacks, stack_revisions, stack_deploys, static_sites,
  static_site_secrets); FK order children-then-parents
- store/models.go: dropped Project, Stage, Deploy, DeployLog, StageEnv,
  Volume, StaticSite, StaticSiteSecret, Stack, StackRevision,
  StackDeploy types; kept WorkloadKind constants as documented strings
- internal/store/helpers.go (new): BoolToInt, rowScanner,
  GenerateWebhookSecret extracted from deleted CRUD files
- internal/api/secrets.go (new): forwards to store.GenerateWebhookSecret
  so api + store paths share one secret-generation impl (no
  panic-vs-UUID-fallback divergence)
- internal/reconciler/reconciler.go: dropped legacy stack-by-compose
  + static-site label paths; only canonical tinyforge.workload.id
  dispatch remains
- providers (gitea_content/github_provider/gitlab_provider) gained
  path-traversal rejection on every tree entry
- internal/webhook ParsedImage / ParseImageRef demoted to package-
  private (no external callers)

Frontend
- /projects /stacks /sites /deploy routes deleted (entire trees)
- ProjectCard / InstanceCard / StaleContainerCard components deleted
- api.ts: dropped every project/stage/stack/site/deploy/instance
  helper + types (Project, Stage, Stack, StaticSite, Deploy,
  Instance, Volume, etc.); kept Workload, Container, App, Settings,
  Registry, EventTrigger, LogScanRule, webhook envelopes
- WorkloadWebhook type + getWorkloadWebhook/regenerateWorkloadWebhook
  api functions gone (mirror of the backend deletion above)
- web/src/routes/+layout.svelte: dropped /projects /sites /stacks
  /deploy nav entries, trimmed quick-nav keymap
- web/src/routes/+page.svelte: dashboard rewrite — reads
  listWorkloads + listContainers only; 4-card stat grid
  (workloads/running/failed/stale) + recent workloads strip
- navCounts.ts, SystemHealthCard.svelte, ContainerLogs.svelte,
  ContainerStats.svelte, StatusBadge.svelte, TagCombobox.svelte,
  proxies/+page.svelte, containers/+page.svelte all rewired to the
  workload-first surface
- AbortController plumbing on dashboard, nav-counts, stale page,
  SystemHealthCard so navigation doesn't leave dangling fetches
- i18n: dropped projects.*, projectDetail.*, envEditor.*,
  volumeEditor.*, volumeBrowser.*, quickDeploy.*, sites.*, stacks.*,
  instance.*, confirm.* namespaces; en/ru parity preserved (1042
  keys each)

Hardening from go-reviewer + security-reviewer + typescript-reviewer
subagent passes (0 CRITICAL across all three; 1 HIGH + ~12 MEDIUM
addressed inline before commit):

- Sec H1: dead-end workload webhook URL handlers (would mint URLs
  that 404 the new trigger-only ingress) deleted across backend +
  frontend
- Go M1: IsTerminalDeployStatus dropped (no production callers)
- Go M2: ParsedImage/ParseImageRef lowercased (in-package only)
- Go M6: generateWebhookSecret unified — api shim forwards to
  store.GenerateWebhookSecret
- Doc/comment freshness: stage_id (no longer FK), ProxyRoute legacy
  field names, workloadIDRow rationale, webhook_deliveries.target_type
  enum, WebhookDeliveryLog component header

Doc
- WORKLOAD_REFACTOR_TODO: cutover marked DONE; all three Priority 1
  items are now shipped. Next focus is Priority 3 polish (apps.* i18n
  + codemap entries) and Priority 4 tests.

Behavioral notes for operators upgrading from a pre-cutover build
- Existing rows in the dropped tables disappear on first boot.
- Legacy webhook URLs at /api/webhook/{secret} and
  /api/webhook/sites/{secret} return 404; CI configs must repoint to
  /api/webhook/triggers/{secret} (the trigger-split boot backfill
  lifted any embedded workload secret onto a Trigger row, so the
  secret value itself carries over).
- Frontend routes /projects /stacks /sites /deploy are gone; nav
  links replaced with /apps and /triggers.

internal/reconciler/reconciler_test.go

@@ -28,17 +28,23 @@ func newTestStore(t *testing.T) *store.Store {
 	return s
 }
 
+// makeWorkload inserts a workload row with the given kind so reconciler
+// dispatch can resolve it by ID.
+func makeWorkload(t *testing.T, st *store.Store, name, kind string) store.Workload {
+	t.Helper()
+	w, err := st.CreateWorkload(store.Workload{
+		Kind: kind, RefID: name + "-ref", Name: name,
+	})
+	if err != nil {
+		t.Fatalf("CreateWorkload: %v", err)
+	}
+	return w
+}
+
 func TestReconcileWorkloadLabelledStackContainer(t *testing.T) {
 	st := newTestStore(t)
 
-	// Set up a stack workload (no project/site interaction).
-	stack, err := st.CreateStack(store.Stack{
-		Name: "wf-stack", ComposeProjectName: "tinyforge-wf-stack",
-	})
-	if err != nil {
-		t.Fatalf("CreateStack: %v", err)
-	}
-	w, _ := st.GetWorkloadByRef(store.WorkloadKindStack, stack.ID)
+	w := makeWorkload(t, st, "wf-stack", "stack")
 
 	// One container with the canonical workload labels stamped.
 	fake := &fakeDocker{items: []docker.ReconcileItem{{
@@ -76,51 +82,10 @@ func TestReconcileWorkloadLabelledStackContainer(t *testing.T) {
 	}
 }
 
-func TestReconcileComposeOnlyStackContainer(t *testing.T) {
-	st := newTestStore(t)
-
-	stack, _ := st.CreateStack(store.Stack{
-		Name: "compose-stack", ComposeProjectName: "tinyforge-compose-stack",
-	})
-	w, _ := st.GetWorkloadByRef(store.WorkloadKindStack, stack.ID)
-
-	// Pre-existing compose container — only carries compose's own labels,
-	// no tinyforge.* labels at all.
-	fake := &fakeDocker{items: []docker.ReconcileItem{{
-		ID:    "docker-xyz",
-		Name:  "tinyforge-compose-stack-worker-1",
-		Image: "redis:7",
-		State: "running",
-		Labels: map[string]string{
-			"com.docker.compose.project": "tinyforge-compose-stack",
-			"com.docker.compose.service": "worker",
-		},
-	}}}
-
-	r := New(st, fake, 0)
-	if err := r.ReconcileOnce(context.Background()); err != nil {
-		t.Fatalf("ReconcileOnce: %v", err)
-	}
-
-	rows, _ := st.ListContainersByWorkload(w.ID)
-	if len(rows) != 1 {
-		t.Fatalf("expected 1 row, got %d", len(rows))
-	}
-	if rows[0].Role != "worker" {
-		t.Fatalf("role from compose label wrong: %q", rows[0].Role)
-	}
-	if rows[0].ContainerID != "docker-xyz" {
-		t.Fatalf("container_id not bound: %q", rows[0].ContainerID)
-	}
-}
-
 func TestReconcileMarksMissingRows(t *testing.T) {
 	st := newTestStore(t)
 
-	stack, _ := st.CreateStack(store.Stack{
-		Name: "missing-stack", ComposeProjectName: "tinyforge-missing-stack",
-	})
-	w, _ := st.GetWorkloadByRef(store.WorkloadKindStack, stack.ID)
+	w := makeWorkload(t, st, "missing-stack", "stack")
 
 	// Pre-existing row with a real container_id that no longer exists.
 	if err := st.UpsertContainer(store.Container{
@@ -145,10 +110,7 @@ func TestReconcileMarksMissingRows(t *testing.T) {
 func TestReconcileSkipsRowsAwaitingDocker(t *testing.T) {
 	st := newTestStore(t)
 
-	stack, _ := st.CreateStack(store.Stack{
-		Name: "pending", ComposeProjectName: "tinyforge-pending",
-	})
-	w, _ := st.GetWorkloadByRef(store.WorkloadKindStack, stack.ID)
+	w := makeWorkload(t, st, "pending", "stack")
 
 	// A row with empty container_id (deployer placeholder, awaiting docker
 	// create). Reconciler must not mark this as missing.
@@ -171,9 +133,8 @@ func TestReconcileSkipsRowsAwaitingDocker(t *testing.T) {
 }
 
 func TestReconcileIgnoresUnmanagedContainers(t *testing.T) {
-	// A container without any tinyforge or compose labels would not even be
-	// returned by ListAllForReconciler in production; but the dispatch must
-	// be a no-op even if a stray item slips through.
+	// A container without the canonical workload label is ignored even if
+	// it carries other labels — only tinyforge.workload.id is honored.
 	st := newTestStore(t)
 	fake := &fakeDocker{items: []docker.ReconcileItem{{
 		ID: "docker-foreign", Labels: map[string]string{"app": "other"},
@@ -197,11 +158,7 @@ func TestReconcileDoesNotClobberDeployerFields(t *testing.T) {
 
 	// Project workload — exercises the path most affected by the regression
 	// (proxies, blue-green slots, image-tag-based stale detection).
-	project, err := st.CreateProject(store.Project{Name: "p", Image: "nginx"})
-	if err != nil {
-		t.Fatalf("CreateProject: %v", err)
-	}
-	w, _ := st.GetWorkloadByRef(store.WorkloadKindProject, project.ID)
+	w := makeWorkload(t, st, "p", "project")
 
 	// Deployer wrote the row with proxy / subdomain / image_tag / stage_id.
 	deployerRow := store.Container{
@@ -277,11 +234,7 @@ func TestReconcileRejectsForgedWorkloadLabel(t *testing.T) {
 // authoritative writer and inventing rows races with MaxInstances > 1 deploys.
 func TestReconcileSkipsProjectInsertWithoutDeployerRow(t *testing.T) {
 	st := newTestStore(t)
-	project, err := st.CreateProject(store.Project{Name: "p2", Image: "nginx"})
-	if err != nil {
-		t.Fatalf("CreateProject: %v", err)
-	}
-	w, _ := st.GetWorkloadByRef(store.WorkloadKindProject, project.ID)
+	w := makeWorkload(t, st, "p2", "project")
 
 	// Reconciler sees a real container with project labels but no deployer
 	// row exists yet (race during deploy).
@@ -306,10 +259,7 @@ func TestReconcileSkipsProjectInsertWithoutDeployerRow(t *testing.T) {
 
 func TestReconcileNormalizesState(t *testing.T) {
 	st := newTestStore(t)
-	stack, _ := st.CreateStack(store.Stack{
-		Name: "norm", ComposeProjectName: "tinyforge-norm",
-	})
-	w, _ := st.GetWorkloadByRef(store.WorkloadKindStack, stack.ID)
+	w := makeWorkload(t, st, "norm", "stack")
 
 	fake := &fakeDocker{items: []docker.ReconcileItem{{
 		ID:    "docker-1",