normalize project structure: src/client + src/server + src/shared

- restructure from src/ + server/ to src/client/ + src/server/ + src/shared/
- switch backend runtime from Node (tsx) to Bun
- merge server/package.json into root, remove @hono/node-server + tsx
- convert server @/ imports to relative paths
- standardize biome config (lineWidth 80, quoteStyle double)
- add CLAUDE.md, .env.example at root
- update vite.config, tsconfig, deploy.sh for new structure

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CLAUDE.md

@@ -0,0 +1,53 @@
+# agw — Abgeordnetenwatch PWA
+
+Political transparency app tracking Bundestag/Landtag votes, politicians, and push notifications.
+
+## Stack
+
+- **Frontend:** React 19, Vite, Tailwind CSS 4, TanStack Router (file-based), Zustand, PGlite, Radix UI
+- **Backend:** Hono (Bun), Drizzle ORM, PostgreSQL, pg-boss (job scheduler), web-push
+- **Linting:** Biome (tabs, 80 chars, double quotes)
+
+## Project Structure
+
+```
+src/
+├── client/          ← React PWA (features/, routes/, shared/)
+├── server/          ← Hono API (features/, shared/)
+└── shared/          ← isomorphic code (types, schemas)
+```
+
+## Local Development
+
+```bash
+bun install
+bun run dev            # frontend (Vite)
+bun run dev:server     # backend (Bun --watch)
+```
+
+## Deployment
+
+```bash
+./deploy.sh
+```
+
+Deploys to Uberspace (`serve.uber.space`):
+- Frontend → `/var/www/virtual/serve/html/agw/`
+- Backend → `~/services/agw-backend/` (systemd: `agw-backend.service`, port 3002)
+- Route: `/agw/api/*` → port 3002 (prefix removed)
+
+## Environment Variables
+
+See `.env.example`:
+- `DATABASE_URL` — PostgreSQL connection string
+- `PORT` — server port (default 3002)
+- `VAPID_PUBLIC_KEY`, `VAPID_PRIVATE_KEY`, `VAPID_SUBJECT` — web push credentials
+
+## Database
+
+PostgreSQL via Drizzle ORM. Migrations in `drizzle/`.
+
+```bash
+bun run db:generate    # generate migration
+bun run db:migrate     # apply migrations
+```