fix(infra): plug operational defaults — pg restart, proxy timeout, env template (0.87.1)

Three operational gaps tripped a recent review:

1. **Postgres had no `restart:` policy.** tor / docker-socket-proxy /
   vision-manager all set `unless-stopped`; pg was the lone exception.
   A transient OOM or panic left backend's `depends_on: service_healthy`
   blocking every future restart and took the stack offline. Add
   `unless-stopped` on postgres and on backend/frontend in the base
   compose so the prod overlay is the same shape.

2. **`BACKEND_PROXY_TIMEOUT_MS` was documented but silently a no-op.**
   `.env.example` carried it but `docker-compose.yml` never forwarded it
   into the frontend service env, so the value never reached
   `hooks.server.ts`. Wire it through.

3. **`.env.example` omitted required env vars.** Operators copying the
   template got no admin bootstrap, no boot-seed crawler URL, no
   analysis configuration. Add: `ADMIN_USERNAME`, `ADMIN_PASSWORD`,
   `PRIVATE_MODE`, `ALLOW_SELF_REGISTER`, `CRAWLER_START_URL`,
   `CRAWLER_CDN_HOST`, `ANALYSIS_ENABLED`, `ANALYSIS_VISION_URL`,
   `ANALYSIS_VISION_MODEL`, `ANALYSIS_WORKERS`,
   `ANALYSIS_JOB_TIMEOUT_SECS`, `ANALYSIS_API_KEY` — each with the
   comment block that explains seed-vs-runtime semantics.

Also adds `frontend/vite.config.ts.timestamp-*.mjs` to `.gitignore` — a
crashed dev server leaves these transient files behind otherwise.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.env.example

@@ -69,6 +69,27 @@ CORS_ALLOWED_ORIGINS=
 # value the browser uses.
 ADMIN_ALLOWED_ORIGINS=
 
+# ----- Admin bootstrap -----
+# When BOTH are set and non-empty, the backend ensures a user with this
+# username exists at startup, promotes it to admin, and (for a brand-new
+# row only) sets the password. An existing user's password is NEVER
+# overwritten by this — rotate via the dashboard or `/auth/me/password`.
+# Leave BOTH empty in a fully provisioned deploy.
+ADMIN_USERNAME=
+ADMIN_PASSWORD=
+
+# ----- Site-wide auth gates (env-ONLY) -----
+# PRIVATE_MODE: when `true`, every endpoint except a small public allowlist
+# (/health, /auth/config, /auth/login, /auth/logout) demands a valid
+# session — anonymous reads return 401. Self-registration is also
+# force-disabled regardless of ALLOW_SELF_REGISTER. Default `false`.
+PRIVATE_MODE=false
+# ALLOW_SELF_REGISTER: when `false`, /auth/register returns 403 and the
+# frontend hides its register affordance. Admins can still mint accounts
+# via /admin/users. Default `true` (open registration). Forced to `false`
+# when PRIVATE_MODE=true.
+ALLOW_SELF_REGISTER=true
+
 # ----- Upload limits -----
 # Per-request body cap. axum rejects oversized requests with 413 before
 # our handlers run. Default 200 MiB.
@@ -182,6 +203,17 @@ BACKEND_PROXY_TIMEOUT_MS=300000
 # analysis ANALYSIS_API_KEY. The important site levers (PRIVATE_MODE,
 # ALLOW_SELF_REGISTER) also remain env-only by design.
 #
+# Crawler boot seeds (effective only on first boot, then editable from the
+# dashboard):
+#   CRAWLER_START_URL   The catalog listing URL the crawler walks. Without
+#                       it, the cron is disabled (no daemon-driven sweeps;
+#                       force-resync from the dashboard still works).
+#   CRAWLER_CDN_HOST    Distinct host the source serves images from. Used to
+#                       set a slower rate limit (CRAWLER_CDN_RATE_MS) and
+#                       seed the download allowlist.
+CRAWLER_START_URL=
+CRAWLER_CDN_HOST=
+#
 # New analysis knobs (all optional, all seed defaults):
 #   ANALYSIS_TEMPERATURE       Sampling temperature. Default 0 (deterministic).
 #   ANALYSIS_SYSTEM_PROMPT     Override the single-call vision system prompt.
@@ -190,6 +222,30 @@ BACKEND_PROXY_TIMEOUT_MS=300000
 # Leave the prompt vars unset to use the built-in defaults (also editable,
 # with a per-prompt "reset to default", in the dashboard).
 
+# ----- Analysis (vision) — boot seeds + env-only secret -----
+# The page-analysis worker (off by default) POSTs each page image at a
+# Chat-Completions-compatible vision endpoint and persists OCR + tags.
+# All fields except ANALYSIS_API_KEY are boot seeds for the app_settings
+# row and switch to dashboard-editable once persisted.
+#
+# ANALYSIS_ENABLED   Turn the worker on at first boot. Toggleable live in
+#                    the dashboard. Default `false`.
+ANALYSIS_ENABLED=false
+# ANALYSIS_VISION_URL  /v1/chat/completions endpoint. Required when enabled.
+#                      For the bundled vision container, use
+#                      http://mangalord-vision:8000/v1/chat/completions.
+ANALYSIS_VISION_URL=
+# ANALYSIS_VISION_MODEL  Model id the endpoint expects (`model:` field).
+ANALYSIS_VISION_MODEL=
+# ANALYSIS_WORKERS  Concurrent vision dispatches. Default 1.
+ANALYSIS_WORKERS=1
+# ANALYSIS_JOB_TIMEOUT_SECS  Hard upper bound per vision call before the
+#                            job is acked failed (backoff). Default 600.
+ANALYSIS_JOB_TIMEOUT_SECS=600
+# ANALYSIS_API_KEY  env-ONLY. Bearer-attached to every vision call; never
+#                   persisted, never logged.
+ANALYSIS_API_KEY=
+
 # ----- Vision autoscaling (the `ai` compose profile) -----
 # The mangalord-vision (llama.cpp) container pins ~4.4 GiB and has no
 # idle-unload, so the `vision-manager` sidecar starts it on demand and