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/sse.go

@@ -2,147 +2,14 @@ package api
 
 import (
 	"encoding/json"
-	"errors"
 	"fmt"
 	"log/slog"
 	"net/http"
-	"strings"
 	"time"
 
-	"github.com/go-chi/chi/v5"
-
 	"github.com/alexei/tinyforge/internal/events"
-	"github.com/alexei/tinyforge/internal/store"
 )
 
-// streamDeployLogs handles GET /api/deploys/{id}/logs.
-// It supports both SSE streaming and JSON fallback based on the Accept header.
-//
-// SSE mode (Accept: text/event-stream):
-//
-//	Streams deploy log events in real-time. Existing logs are sent first,
-//	then new logs are pushed as they arrive via the event bus.
-//
-// JSON mode (default):
-//
-//	Returns all existing deploy logs as a JSON array.
-func (s *Server) streamDeployLogs(w http.ResponseWriter, r *http.Request) {
-	deployID := chi.URLParam(r, "id")
-
-	// Verify deploy exists.
-	deploy, err := s.store.GetDeployByID(deployID)
-	if err != nil {
-		if errors.Is(err, store.ErrNotFound) {
-			respondNotFound(w, "deploy")
-			return
-		}
-		slog.Error("failed to get deploy", "error", err)
-		respondError(w, http.StatusInternalServerError, "internal server error")
-		return
-	}
-
-	// JSON fallback: return existing logs as array.
-	accept := r.Header.Get("Accept")
-	if !strings.Contains(accept, "text/event-stream") {
-		logs, err := s.store.GetDeployLogs(deployID)
-		if err != nil {
-			slog.Error("failed to get deploy logs", "error", err)
-			respondError(w, http.StatusInternalServerError, "internal server error")
-			return
-		}
-		respondJSON(w, http.StatusOK, logs)
-		return
-	}
-
-	// SSE mode.
-	release, ok := acquireSSESlot(w, s.sseGate)
-	if !ok {
-		return
-	}
-	defer release()
-
-	flusher, ok := w.(http.Flusher)
-	if !ok {
-		respondError(w, http.StatusInternalServerError, "streaming not supported")
-		return
-	}
-
-	w.Header().Set("Content-Type", "text/event-stream")
-	w.Header().Set("Cache-Control", "no-cache")
-	w.Header().Set("Connection", "keep-alive")
-	w.Header().Set("X-Accel-Buffering", "no")
-	w.WriteHeader(http.StatusOK)
-	flusher.Flush()
-
-	// Send existing logs first.
-	existingLogs, err := s.store.GetDeployLogs(deployID)
-	if err != nil {
-		slog.Error("get existing deploy logs", "error", err)
-	} else {
-		for _, entry := range existingLogs {
-			writeSSE(w, flusher, events.Event{
-				Type: events.EventDeployLog,
-				Payload: events.DeployLogPayload{
-					DeployID: deployID,
-					Message:  entry.Message,
-					Level:    entry.Level,
-				},
-			})
-		}
-	}
-
-	// If deploy is already finished, send completion and close.
-	if isTerminalStatus(deploy.Status) {
-		writeSSE(w, flusher, events.Event{
-			Type: events.EventDeployStatus,
-			Payload: events.DeployStatusPayload{
-				DeployID:  deployID,
-				ProjectID: deploy.ProjectID,
-				StageID:   deploy.StageID,
-				ImageTag:  deploy.ImageTag,
-				Status:    deploy.Status,
-				Error:     deploy.Error,
-			},
-		})
-		return
-	}
-
-	// Subscribe to new deploy log events for this deploy.
-	sub := s.eventBus.Subscribe(func(evt events.Event) bool {
-		switch payload := evt.Payload.(type) {
-		case events.DeployLogPayload:
-			return payload.DeployID == deployID
-		case events.DeployStatusPayload:
-			return payload.DeployID == deployID
-		default:
-			return false
-		}
-	})
-	defer s.eventBus.Unsubscribe(sub)
-
-	ctx := r.Context()
-	for {
-		select {
-		case <-ctx.Done():
-			return
-		case evt, ok := <-sub:
-			if !ok {
-				return
-			}
-			writeSSE(w, flusher, evt)
-
-			// Close stream when deploy reaches terminal status.
-			if evt.Type == events.EventDeployStatus {
-				if payload, ok := evt.Payload.(events.DeployStatusPayload); ok {
-					if isTerminalStatus(payload.Status) {
-						return
-					}
-				}
-			}
-		}
-	}
-}
-
 // streamEvents handles GET /api/events.
 // It streams instance status changes and deploy status changes via SSE.
 func (s *Server) streamEvents(w http.ResponseWriter, r *http.Request) {
@@ -203,8 +70,3 @@ func writeSSE(w http.ResponseWriter, flusher http.Flusher, evt events.Event) {
 	fmt.Fprintf(w, "data: %s\n\n", data)
 	flusher.Flush()
 }
-
-// isTerminalStatus returns true if the deploy status is final.
-func isTerminalStatus(status string) bool {
-	return store.IsTerminalDeployStatus(status)
-}