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/api.ts

@@ -32,7 +32,7 @@ import type {
 
 // ── Helpers ─────────────────────────────────────────────────────────
 
-class ApiError extends Error {
+export class ApiError extends Error {
 	constructor(
 		message: string,
 		public readonly status: number
@@ -141,11 +141,13 @@ function get<T>(path: string, signal?: AbortSignal): Promise<T> {
 	return request<T>(path, signal ? { signal } : undefined);
 }
 
-function post<T>(path: string, body?: unknown): Promise<T> {
-	return request<T>(path, {
+function post<T>(path: string, body?: unknown, signal?: AbortSignal): Promise<T> {
+	const init: RequestInit = {
 		method: 'POST',
 		body: body !== undefined ? JSON.stringify(body) : undefined
-	});
+	};
+	if (signal) init.signal = signal;
+	return request<T>(path, init);
 }
 
 function put<T>(path: string, body: unknown): Promise<T> {
@@ -171,8 +173,146 @@ function patch<T>(path: string, body: unknown): Promise<T> {
 // image port/healthcheck. `quickDeploy` (POST /api/deploy/quick) is gone:
 // it created a legacy Project + Stage in the now-dead path.
 
-export function inspectImage(image: string): Promise<InspectResult> {
-	return post<InspectResult>('/api/deploy/inspect', { image });
+export function inspectImage(image: string, signal?: AbortSignal): Promise<InspectResult> {
+	return post<InspectResult>('/api/deploy/inspect', { image }, signal);
+}
+
+// ── Discovery (/apps/new wizard helpers) ───────────────────────────
+// These endpoints back the auto-discovery + connection-test flow that
+// the static-site creation wizard used in the legacy /sites/new page.
+// They are admin-gated; the token is plaintext over HTTPS and is not
+// persisted server-side.
+
+// GitProviderKind is the union the *frontend* sends. The empty string
+// means "auto-detect server-side" (DetectProviderWithProbe runs).
+export type GitProviderKind = '' | 'gitea' | 'github' | 'gitlab';
+
+// DetectedGitProvider is the narrower union the backend's detect
+// endpoint actually returns — `staticsite.DetectProviderWithProbe`
+// always resolves to one of the three concrete kinds (it falls back to
+// `gitea` for unknown hosts). Kept distinct from GitProviderKind so a
+// successful detection cannot ever set the dropdown back to "".
+export type DetectedGitProvider = 'gitea' | 'github' | 'gitlab';
+
+export interface RepoInfo {
+	owner: string;
+	name: string;
+	full_name: string;
+	description: string;
+	private: boolean;
+	html_url: string;
+}
+
+export interface FolderEntry {
+	path: string;
+	is_dir: boolean;
+}
+
+export interface DiscoveryGitRequest {
+	provider?: GitProviderKind;
+	base_url: string;
+	access_token?: string;
+	repo_owner?: string;
+	repo_name?: string;
+	branch?: string;
+	query?: string;
+}
+
+export interface ImageConflict {
+	id: string;
+	name: string;
+	image: string;
+	app_id?: string;
+}
+
+export function detectGitProvider(
+	baseURL: string,
+	signal?: AbortSignal
+): Promise<{ provider: DetectedGitProvider }> {
+	return post<{ provider: DetectedGitProvider }>(
+		'/api/discovery/git/detect-provider',
+		{ base_url: baseURL },
+		signal
+	);
+}
+
+export function testGitConnection(
+	req: DiscoveryGitRequest,
+	signal?: AbortSignal
+): Promise<{ status: string }> {
+	return post<{ status: string }>('/api/discovery/git/test-connection', req, signal);
+}
+
+export function listGitRepos(req: DiscoveryGitRequest, signal?: AbortSignal): Promise<RepoInfo[]> {
+	return post<RepoInfo[]>('/api/discovery/git/repos', req, signal);
+}
+
+export function listGitBranches(
+	req: DiscoveryGitRequest,
+	signal?: AbortSignal
+): Promise<string[]> {
+	return post<string[]>('/api/discovery/git/branches', req, signal);
+}
+
+export function listGitTree(req: DiscoveryGitRequest, signal?: AbortSignal): Promise<FolderEntry[]> {
+	return post<FolderEntry[]>('/api/discovery/git/tree', req, signal);
+}
+
+export function listImageConflicts(image: string, signal?: AbortSignal): Promise<ImageConflict[]> {
+	return get<ImageConflict[]>(
+		`/api/discovery/image/conflicts?image=${encodeURIComponent(image)}`,
+		signal
+	);
+}
+
+// ── Workload runtime view (runtime-state, storage, stop, start) ────
+// Backed by internal/api/workload_runtime.go. The shapes mirror the
+// Go side exactly so the UI can render without further normalization.
+
+export interface WorkloadRuntimeState {
+	source_kind: string;
+	has_state: boolean;
+	container_id?: string;
+	state?: string;
+	status?: string;
+	last_commit_sha?: string;
+	last_sync_at?: string;
+	last_error?: string;
+}
+
+export interface WorkloadStorageUsage {
+	source_kind: string;
+	enabled: boolean;
+	used_bytes: number;
+	limit_mb?: number;
+	probe_error?: string;
+}
+
+export interface StopStartResult {
+	touched: number;
+	failed: number;
+}
+
+export function getWorkloadRuntimeState(
+	id: string,
+	signal?: AbortSignal
+): Promise<WorkloadRuntimeState> {
+	return get<WorkloadRuntimeState>(`/api/workloads/${id}/runtime-state`, signal);
+}
+
+export function getWorkloadStorage(
+	id: string,
+	signal?: AbortSignal
+): Promise<WorkloadStorageUsage> {
+	return get<WorkloadStorageUsage>(`/api/workloads/${id}/storage`, signal);
+}
+
+export function stopWorkload(id: string): Promise<StopStartResult> {
+	return post<StopStartResult>(`/api/workloads/${id}/stop`);
+}
+
+export function startWorkload(id: string): Promise<StopStartResult> {
+	return post<StopStartResult>(`/api/workloads/${id}/start`);
 }
 
 // ── Registries ──────────────────────────────────────────────────────
@@ -1055,4 +1195,3 @@ export function getLogScanStats(signal?: AbortSignal): Promise<LogScanStats> {
 	return get<LogScanStats>('/api/log-scan-rules/stats', signal);
 }
 
-export { ApiError };