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/api/dns.go

@@ -190,27 +190,34 @@ func (s *Server) deleteDNSRecord(w http.ResponseWriter, r *http.Request) {
 	respondJSON(w, http.StatusOK, map[string]string{"status": "deleted"})
 }
 
-// buildConsumerNameMap builds a lookup of "type:id" -> display name for DNS consumers.
+// buildConsumerNameMap builds a lookup of "type:id" -> display name for DNS
+// consumers. Sourced from the containers index now that legacy project/stage
+// tables are gone — the workload's name + the container's role + tag is what
+// operators see in the UI.
 func (s *Server) buildConsumerNameMap() map[string]string {
 	names := make(map[string]string)
-
-	// Instance consumers: "instance:id" -> "project/stage:tag"
-	projects, _ := s.store.GetAllProjects()
-	projectNames := make(map[string]string, len(projects))
-	for _, p := range projects {
-		projectNames[p.ID] = p.Name
+	containers, err := s.store.ListContainers(store.ContainerFilter{})
+	if err != nil {
+		return names
 	}
-
-	for _, p := range projects {
-		stages, _ := s.store.GetStagesByProjectID(p.ID)
-		for _, st := range stages {
-			rows, _ := s.store.ListContainersByStageID(st.ID)
-			for _, c := range rows {
-				names["instance:"+c.ID] = p.Name + "/" + st.Name + ":" + c.ImageTag
+	workloadNames := make(map[string]string)
+	for _, c := range containers {
+		wname, ok := workloadNames[c.WorkloadID]
+		if !ok {
+			if w, err := s.store.GetWorkloadByID(c.WorkloadID); err == nil {
+				wname = w.Name
 			}
+			workloadNames[c.WorkloadID] = wname
 		}
+		label := wname
+		if c.Role != "" {
+			label = label + "/" + c.Role
+		}
+		if c.ImageTag != "" {
+			label = label + ":" + c.ImageTag
+		}
+		names["instance:"+c.ID] = label
 	}
-
 	return names
 }
 
@@ -343,38 +350,26 @@ func (s *Server) syncDNSRecords(w http.ResponseWriter, r *http.Request) {
 	})
 }
 
-// computeExpectedFQDNs returns a map of FQDN -> "consumerType:consumerID" for all active DNS consumers.
+// computeExpectedFQDNs returns a map of FQDN -> "consumerType:consumerID"
+// for every running container that has a proxy route configured. Sourced
+// directly from the containers index — the workload-first cutover dropped
+// the per-stage enable_proxy toggle in favour of "if a proxy route ID
+// exists, the workload wanted a route."
 func (s *Server) computeExpectedFQDNs(settings store.Settings) (map[string]string, error) {
 	expected := make(map[string]string)
-
-	// Instances with proxy enabled.
-	projects, err := s.store.GetAllProjects()
+	containers, err := s.store.ListContainers(store.ContainerFilter{})
 	if err != nil {
-		return nil, fmt.Errorf("get projects: %w", err)
+		return nil, fmt.Errorf("list containers: %w", err)
 	}
-	for _, p := range projects {
-		stages, err := s.store.GetStagesByProjectID(p.ID)
-		if err != nil {
-			slog.Warn("dns: failed to get stages", "project_id", p.ID, "error", err)
+	for _, c := range containers {
+		if c.Subdomain == "" || c.State != "running" {
 			continue
 		}
-		for _, st := range stages {
-			if !st.EnableProxy {
-				continue
-			}
-			rows, err := s.store.ListContainersByStageID(st.ID)
-			if err != nil {
-				slog.Warn("dns: failed to get containers", "stage_id", st.ID, "error", err)
-				continue
-			}
-			for _, c := range rows {
-				if c.NpmProxyID > 0 && c.Subdomain != "" && c.State == "running" {
-					fqdn := c.Subdomain + "." + settings.Domain
-					expected[fqdn] = "instance:" + c.ID
-				}
-			}
+		if c.NpmProxyID == 0 && c.ProxyRouteID == "" {
+			continue
 		}
+		fqdn := c.Subdomain + "." + settings.Domain
+		expected[fqdn] = "instance:" + c.ID
 	}
-
 	return expected, nil
 }