feat(discovery+runtime): restore static-site wizard discovery + close /sites/[id] feature parity

Two-stage feature arc closing the gaps left by the hard legacy cutover.
The static-site creation wizard regains its auto-discovery + connection-test
flow; /apps/[id] grows the runtime/storage/lifecycle surface the legacy
/sites/[id] page used to expose.

Backend (Go)
- internal/api/discovery.go: six admin-gated endpoints wrapping
  staticsite.GitProvider — POST /api/discovery/git/{detect-provider,
  test-connection,repos,branches,tree} + GET /api/discovery/image/conflicts.
  Identifier validation (validateGitIdent / validateGitBranch) at the
  boundary so provider URL interpolation cannot be hijacked via `..`.
  Upstream errors scrubbed: detailed slog on the server, generic 502 to
  the client (mitigates token-reflection-in-error-page).
- internal/api/workload_runtime.go: four endpoints —
  GET /api/workloads/{id}/runtime-state decodes containers.extra_json for
  static workloads; GET /api/workloads/{id}/storage execs `du -sb /app/data`
  with a 30s in-process cache (storageProbeCache) so polling can't turn
  into per-request execs; POST /api/workloads/{id}/{stop,start} iterate
  ListContainersByWorkload and call docker.StopContainer / StartContainer,
  returning 200 / 409 (nothing to act on) / 502 (all failed).
- internal/staticsite/safehttp.go: NewSafeHTTPClient + ValidateBaseURL +
  blockReason. DialContext re-resolves hostnames and refuses loopback /
  link-local / multicast / unspecified addresses. RFC1918 + ULA explicitly
  allowed (self-hosted Gitea on LAN is the dominant deployment).
  Replaced four raw &http.Client{} constructions in the provider files.
- internal/staticsite/gitlab_provider.go: url.PathEscape each segment in
  the raw-file URL builder for parity with projectPath().
- Test coverage: 26 cases in discovery_test.go (image-tag stripping,
  source-config decoding, conflict scenarios, validator boundaries,
  scheme rejection), 14 in workload_runtime_test.go (404 / 409 / nil-docker
  / probe-cache), 16 in safehttp_test.go (URL validation + block-reason
  policy matrix + live dial against loopback + AWS metadata literals).

Frontend (Svelte 5 + runes)
- web/src/lib/api.ts: typed wrappers for every endpoint, AbortSignal
  threaded through post(); ApiError exported so callers can narrow on
  e.status; new DetectedGitProvider narrow union.
- web/src/routes/apps/new/+page.svelte: static-form discovery controls
  (auto-detect provider, test connection, repo / branch / folder
  EntityPickers, Deno auto-detect); image-form conflict panel with
  debounced lookup + double-click submit guard ("Forge anyway") + Inspect
  button that pre-fills port/healthcheck; English error fallbacks routed
  through apps.new.errors.* (en + ru).
- web/src/routes/apps/[id]/+page.svelte: runtime-state panel + storage
  panel + Stop / Start / Open-site toolbar; universal live-state badge
  in the hero lede for image/compose/static (RUNNING / TRANSITIONING /
  STOPPED / NOT DEPLOYED / MIXED · n/m RUNNING); ContainerStats panel
  per row (auto-collapsing native <details> when N > 2); read-only
  webhook bindings summary card; responsive toolbar overflow with native
  <details> at <640px (z-index 100 above sticky nav).
- web/src/app.css: project-wide .forge-btn-ghost:focus-visible outline.

Hardening from go-reviewer + security-reviewer + typescript-reviewer +
frontend-design UI/UX subagents (0 CRITICAL, all HIGH/BLOCKER addressed
inline, IMPORTANT applied before commit):
- AbortController + per-call sequence tokens on every long-running
  fetch (loadRuntimeState / loadStorage / loadTriggerMeta / inspectImage /
  listImageConflicts) plus onDestroy cleanup so late resolves cannot
  mutate dead component state.
- doStop / doStart snapshot and restore `error` across the finally-block
  reload so a load()-cleared message doesn't hide a real failure.
- triggersById refreshed after inline trigger creation so the webhook
  card doesn't silently exclude the just-created trigger.
- Live-state badge wraps in role=status / aria-live=polite (no redundant
  aria-label).
- Webhook row has a single click target (was two pointing at the same URL).
- Empty webhook section hides entirely.
- Dropped role=menu / role=menuitem from the overflow menu (they would
  promise arrow-key nav we don't wire; native Tab + ESC carry it).

Doc
- docs/CODEMAPS/INDEX.md + new docs/CODEMAPS/discovery-and-runtime.md
  map the endpoint surface, security posture, frontend integration
  patterns, and an "add a new probe" recipe.

Verification
- svelte-check: 0 errors, 3 pre-existing a11y warnings.
- go build + go vet + go test ./...: all green.
- i18n parity: en + ru at 1413 keys each.
- Live smoke against :8090: 404 / 409 / 502 envelopes correct, discovery
  sanity passes, ProbeError surfaces on no-container path.

web/src/lib/i18n/en.json

@@ -1253,6 +1253,29 @@
       "staticRenderMarkdown": "Render markdown",
       "staticRenderMarkdownDesc": "— auto-render <code>.md</code> files as HTML pages.",
       "staticFoot": "The webhook secret for git push triggers lives on the workload's Webhook panel after creation.",
+      "staticDetectProvider": "Detect",
+      "staticDetectedOk": "Detected: {provider}",
+      "staticDetectedFailed": "Detection failed: {error}",
+      "staticTestConnection": "Test connection",
+      "staticConnectionOk": "Connected",
+      "staticConnectionFailed": "Connection failed: {error}",
+      "staticBrowseRepos": "Browse repositories",
+      "staticBrowseBranches": "Browse branches",
+      "staticBrowseFolders": "Browse folders",
+      "staticPickerRepoTitle": "Select repository",
+      "staticPickerRepoPlaceholder": "Filter repositories…",
+      "staticPickerBranchTitle": "Select branch",
+      "staticPickerBranchPlaceholder": "Filter branches…",
+      "staticFolderRoot": "/ (root)",
+      "staticFolderSelectedPrefix": "Selected folder:",
+      "staticTreeLoading": "Loading folder tree…",
+      "staticTreeEmpty": "No folders found in this branch.",
+      "staticDenoAutoDetected": "Auto-detected an <code>api/</code> folder — switched to Deno mode.",
+      "imageConflictTag": "IMAGE IN USE",
+      "imageConflictHeading": "{count} workload(s) already use this image:",
+      "imageConflictOpenBtn": "Open",
+      "imageConflictAcknowledgeNote": "If this is intentional (for example a separate stage), continue to create a new workload.",
+      "imageConflictBlockedSubmit": "Conflicts detected for this image — review the list above, then click Create again to proceed.",
       "sourceConfigJsonTitle": "source_config.json · {kind}",
       "sourceConfigJsonAria": "Source plugin configuration (JSON)",
       "triggerNumLabel": "Trigger",
@@ -1273,6 +1296,22 @@
       "cancel": "Cancel",
       "submit": "Forge app",
       "submitting": "Forging…",
+      "submitAnyway": "Forge anyway",
+      "errors": {
+        "detectionFailed": "Provider detection failed.",
+        "connectionFailed": "Connection failed.",
+        "reposFailed": "Failed to load repositories.",
+        "branchesFailed": "Failed to load branches.",
+        "treeFailed": "Failed to load folder tree.",
+        "sourceConfigInvalid": "Source config is not valid JSON.",
+        "triggerBindUnknown": "unknown error",
+        "createFailed": "Workload create failed.",
+        "inspectFailed": "Image inspect failed."
+      },
+      "imageInspect": "Inspect",
+      "imageInspectHint": "Pulls port + healthcheck from the image so you don't have to type them.",
+      "imageInspectOk": "Inspected — port + healthcheck filled.",
+      "imageInspectError": "Inspect failed: {error}",
       "triggers": {
         "section": "Trigger",
         "sectionSub": "Optional. Pick how this app gets a redeploy signal — registry watcher, git event, or manual button.",
@@ -1304,6 +1343,60 @@
       "deployError": "Deploy failed",
       "saveError": "Save failed",
       "deleteError": "Delete failed",
+      "runtimeState": {
+        "title": "Sync status",
+        "sub": "Last successful sync of the source repo and the current container state.",
+        "status": "Status",
+        "lastCommit": "Last commit",
+        "lastSync": "Last sync",
+        "container": "Container",
+        "neverDeployed": "Never deployed. Click Deploy to publish for the first time.",
+        "loading": "Loading runtime state…"
+      },
+      "storage": {
+        "title": "Persistent storage",
+        "sub": "Mounted at /app/data inside the container.",
+        "used": "Used",
+        "limit": "Limit",
+        "unlimited": "unlimited",
+        "unavailable": "Usage probe unavailable (container may be stopped).",
+        "loading": "Computing usage…"
+      },
+      "toolbar": {
+        "stop": "Stop",
+        "start": "Start",
+        "openSite": "Open",
+        "more": "More"
+      },
+      "liveBadge": {
+        "running": "RUNNING",
+        "transitioning": "TRANSITIONING",
+        "stopped": "STOPPED",
+        "notDeployed": "NOT DEPLOYED",
+        "mixed": "MIXED · {running}/{total} RUNNING"
+      },
+      "stats": {
+        "title": "Resource usage",
+        "sub": "CPU and memory of the running container.",
+        "subMany": "CPU and memory of each of the {count} containers."
+      },
+      "webhooks": {
+        "title": "Webhook bindings",
+        "sub": "Triggers wired to this app — manage URLs and signing on the trigger detail page.",
+        "openTrigger": "Open trigger",
+        "disabled": "disabled",
+        "empty": "No triggers bound to this app."
+      },
+      "errors": {
+        "stopFailed": "Stop failed.",
+        "stopNothing": "Nothing to stop — no running container.",
+        "stopAllFailed": "Stop failed — all containers refused to stop.",
+        "startFailed": "Start failed.",
+        "startNothing": "Nothing to start — deploy first to create a container.",
+        "startAllFailed": "Start failed — all containers refused to start.",
+        "runtimeStateFailed": "Failed to load runtime state.",
+        "storageFailed": "Failed to load storage usage."
+      },
       "alertTag": "ERR",
       "createdAt": "created",
       "refreshLabel": "Refresh",