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/config/export.go

@@ -1,7 +1,6 @@
 package config
 
 import (
-	"encoding/json"
 	"fmt"
 
 	"github.com/alexei/tinyforge/internal/store"
@@ -9,8 +8,10 @@ import (
 )
 
 // ExportConfig reads the current database state and produces a SeedConfig YAML
-// representation. Credential fields (tokens, passwords) are exported as placeholder
-// strings since they are encrypted in the database.
+// representation. Credential fields (tokens, passwords) are exported as
+// placeholder strings since they are encrypted in the database. After the hard
+// cutover, only global settings + registries are exported — workloads and
+// triggers are created through the API, not via seed files.
 func ExportConfig(db *store.Store) ([]byte, error) {
 	cfg, err := buildSeedConfig(db)
 	if err != nil {
@@ -25,7 +26,6 @@ func ExportConfig(db *store.Store) ([]byte, error) {
 	return data, nil
 }
 
-// buildSeedConfig constructs a SeedConfig from the current database state.
 func buildSeedConfig(db *store.Store) (SeedConfig, error) {
 	settings, err := db.GetSettings()
 	if err != nil {
@@ -37,11 +37,6 @@ func buildSeedConfig(db *store.Store) (SeedConfig, error) {
 		return SeedConfig{}, fmt.Errorf("get registries: %w", err)
 	}
 
-	projects, err := db.GetAllProjects()
-	if err != nil {
-		return SeedConfig{}, fmt.Errorf("get projects: %w", err)
-	}
-
 	cfg := SeedConfig{
 		Global: GlobalConfig{
 			Domain:           settings.Domain,
@@ -56,7 +51,6 @@ func buildSeedConfig(db *store.Store) (SeedConfig, error) {
 			},
 		},
 		Registries: make(map[string]RegistryDef),
-		Projects:   make(map[string]ProjectDef),
 	}
 
 	for _, reg := range registries {
@@ -67,52 +61,5 @@ func buildSeedConfig(db *store.Store) (SeedConfig, error) {
 		}
 	}
 
-	for _, proj := range projects {
-		stages, err := db.GetStagesByProjectID(proj.ID)
-		if err != nil {
-			return SeedConfig{}, fmt.Errorf("get stages for project %s: %w", proj.Name, err)
-		}
-
-		stageDefs := make(map[string]StageDef)
-		for _, st := range stages {
-			stageDefs[st.Name] = StageDef{
-				TagPattern:   st.TagPattern,
-				AutoDeploy:   st.AutoDeploy,
-				MaxInstances: st.MaxInstances,
-				Confirm:      st.Confirm,
-				PromoteFrom:  st.PromoteFrom,
-				Subdomain:    st.Subdomain,
-			}
-		}
-
-		envMap := parseJSONMap(proj.Env)
-		volMap := parseJSONMap(proj.Volumes)
-
-		cfg.Projects[proj.Name] = ProjectDef{
-			Registry:    proj.Registry,
-			Image:       proj.Image,
-			Port:        proj.Port,
-			Healthcheck: proj.Healthcheck,
-			Env:         envMap,
-			Volumes:     volMap,
-			Stages:      stageDefs,
-		}
-	}
-
 	return cfg, nil
 }
-
-// parseJSONMap safely parses a JSON-encoded map string. Returns nil on failure.
-func parseJSONMap(jsonStr string) map[string]string {
-	if jsonStr == "" || jsonStr == "{}" {
-		return nil
-	}
-	var m map[string]string
-	if err := json.Unmarshal([]byte(jsonStr), &m); err != nil {
-		return nil
-	}
-	if len(m) == 0 {
-		return nil
-	}
-	return m
-}