feat(sync): sync all FDISK members, auto-creating dashboard accounts for users not yet logged in

CLAUDE.md

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+# Feuerwehr Dashboard — Project Rules
+
+## Stack
+- **Frontend:** React / Vite / MUI / TypeScript (`frontend/`)
+- **Backend:** Node / Express / TypeScript (`backend/`)
+- **DB:** PostgreSQL — migrations in `backend/src/database/migrations/`
+- **Deployment:** Docker Compose — never run Docker commands locally
+
+## Migrations
+- All migrations must be idempotent (safe to run multiple times)
+- Verify column and table names match existing schema before writing
+- Never rename env vars used by external systems without explicit approval
+
+## Data Safety
+- "Purge user data" means delete records / preferences / history only — never delete user accounts
+
+## Debugging Scope
+- When debugging, only touch files directly related to the change you made
+- Never edit files in another layer without explicit permission
+- If a fix requires a cross-layer change, report it rather than making it unilaterally
+
+## Multi-Agent Work
+- After all agents complete, run a verification pass: build, migrations, UI states, modal behavior
+- All agent task descriptions must be self-contained (file paths, patterns, acceptance criteria)