Phase 0: repo skeleton, image, compose stacks, doctor, migration runner, frontend shell

New repo for the Packet Station rebuild (Python 3.12, FastAPI, PostgreSQL 16,
React, VisualKit, MFilesKit, Docker Compose on docker-1). Nothing is migrated
from the M: install.

- CLAUDE.md with the safety rules, README, CHANGELOG, docs (BRIEF, PLAN,
  SECURITY rewritten for the server with the requirement ID table, DEPLOY,
  stubs for FEED, POLICY, SCHEMA, GO-LIVE, PAPER-FALLBACK).
- packetstation CLI: app, worker (heartbeat stub), migrate, doctor, version,
  healthcheck. Settings from the environment with secret files. Stack guard
  (test never points at VISUAL production). Security headers and CSP.
  Trusted proxy resolved by name. JSON logs with redaction.
- Migration runner and 0001_base: settings, append-only audit_events with
  hash chain, ps_notify, grants for ps_app.
- Multi-stage Dockerfile (ODBC Driver 18, PESCO libraries from the Gitea
  index only), compose base, proxy overlay for npm_default, CI overlay,
  postgres initdb roles, env examples, NPM proxy host notes, Gitea Actions.
- Frontend: Vite, React, TypeScript, the PESCO dark theme ported with
  self-hosted fonts, placeholder sign-in and home.
- Verified on docker-1: image builds, CI stack comes up healthy, doctor
  database checks pass, 77 server tests pass against PostgreSQL.

Co-Authored-By: Claude Fable 5.1 <[email protected]>

server/packetstation/main.py

@@ -0,0 +1,112 @@
+"""The FastAPI app. `packetstation.main:app` is built on first access so imports need no settings."""
+
+from __future__ import annotations
+
+import asyncio
+import contextlib
+import logging
+from collections.abc import AsyncIterator
+from pathlib import Path
+from typing import Any
+
+from fastapi import FastAPI
+from fastapi.responses import FileResponse, HTMLResponse, JSONResponse, Response
+from starlette.concurrency import run_in_threadpool
+
+from . import db, guard
+from .proxy import TrustedProxies, TrustedProxyMiddleware
+from .security import RequestLogMiddleware, SecurityHeadersMiddleware
+from .settings import Settings, get_settings
+
+log = logging.getLogger(__name__)
+
+PLACEHOLDER = """<!doctype html>
+<html lang="en"><head><meta charset="utf-8"><title>Packet Station</title></head>
+<body><h1>Packet Station</h1><p>The web client is not built into this image (STATIC_DIR missing).</p></body></html>
+"""
+
+NO_FALLBACK = ("api", "_blob")
+
+
+def _static_file(static_dir: Path, path: str) -> Path | None:
+    """The file under static_dir for a URL path, or None. Never escapes static_dir."""
+    if not path:
+        return None
+    root = static_dir.resolve()
+    candidate = (root / path).resolve()
+    if not candidate.is_relative_to(root) or not candidate.is_file():
+        return None
+    return candidate
+
+
+def create_app(settings: Settings | None = None, *, run_guard: bool = True) -> FastAPI:
+    s = settings or get_settings()
+    if run_guard:
+        guard.startup_checks(s)
+    trusted = TrustedProxies(s.trusted_proxy_host)
+
+    @contextlib.asynccontextmanager
+    async def lifespan(_: FastAPI) -> AsyncIterator[None]:
+        await asyncio.to_thread(trusted.refresh)
+        task = asyncio.create_task(trusted.run()) if trusted.host else None
+        log.info("packetstation app starting", extra={"ps": {"build": s.ps_build, "stack": s.stack}})
+        try:
+            yield
+        finally:
+            if task:
+                task.cancel()
+            await run_in_threadpool(db.close_pool)
+
+    app = FastAPI(
+        title="Packet Station", version=s.ps_build, lifespan=lifespan, docs_url=None, redoc_url=None, openapi_url=None
+    )
+    app.state.settings = s
+    app.state.trusted = trusted
+
+    @app.get("/healthz")
+    def healthz() -> dict[str, Any]:
+        return {"ok": True, "build": s.ps_build}
+
+    @app.get("/api/version")
+    def version() -> dict[str, Any]:
+        return {"build": s.ps_build, "stack": s.stack, "site_tz": s.site_tz}
+
+    @app.get("/api/db-health")
+    def db_health() -> Response:
+        try:
+            db.ping(s)
+        except db.DatabaseUnavailable:
+            log.warning("db-health: database unavailable")
+            return JSONResponse({"ok": False, "error": "database unavailable"}, status_code=503)
+        return JSONResponse({"ok": True})
+
+    @app.api_route("/{path:path}", methods=["GET", "HEAD"], include_in_schema=False)
+    def static(path: str) -> Response:
+        if path.split("/", 1)[0] in NO_FALLBACK:
+            return JSONResponse({"detail": "Not Found"}, status_code=404)
+        static_dir = s.static_dir
+        index = static_dir / "index.html"
+        if not index.is_file():
+            return HTMLResponse(PLACEHOLDER)
+        found = _static_file(static_dir, path)
+        if found is not None:
+            return FileResponse(found)
+        return FileResponse(index, headers={"Cache-Control": "no-cache"})
+
+    # Last added runs first: proxy rewrite, then the log (sees the real ip), then headers
+    app.add_middleware(SecurityHeadersMiddleware)
+    app.add_middleware(RequestLogMiddleware, build=s.ps_build)
+    app.add_middleware(TrustedProxyMiddleware, trusted=trusted)
+    return app
+
+
+_app: FastAPI | None = None
+
+
+def __getattr__(name: str) -> Any:
+    global _app
+    if name == "app":
+        if _app is None:
+            _app = create_app()
+        return _app
+    raise AttributeError(name)