feat(auth): Implementiere vollständiges Auth-System

- JWT Access + Refresh Tokens mit djwt
- Argon2 Password Hashing (OWASP konfig)
- Rate Limiting für Auth-Endpoints
- Rollen-basierte Zugriffskontrolle (owner, admin, manager, user)
- DSGVO Audit Logging
- Email-Verifizierung (Struktur)
- Passwort-Reset Flow
- Multi-Device Logout

Neue Dateien:
- src/types/index.ts - TypeScript Interfaces
- src/db/connection.ts - PostgreSQL Pool
- src/services/password.ts - Argon2 Hashing
- src/services/jwt.ts - Token Generation
- src/services/audit.ts - DSGVO Audit Log
- src/middleware/auth.ts - Auth Middleware
- src/repositories/user.ts - User DB Queries
- src/repositories/organization.ts - Org DB Queries
- src/utils/response.ts - API Response Helpers

Task: #8 Authentifizierung & Benutzerverwaltung

deno.json

@@ -2,9 +2,12 @@
   "name": "pulse-crm-backend",
   "version": "0.1.0",
   "tasks": {
-    "dev": "deno run --allow-net --allow-env --allow-read --watch src/main.ts",
-    "start": "deno run --allow-net --allow-env --allow-read src/main.ts",
-    "test": "deno test --allow-net --allow-env --allow-read",
+    "dev": "deno run --allow-net --allow-env --allow-read --allow-ffi --watch src/main.ts",
+    "start": "deno run --allow-net --allow-env --allow-read --allow-ffi src/main.ts",
+    "test": "deno test --allow-net --allow-env --allow-read --allow-ffi",
+    "check": "deno check src/main.ts",
+    "lint": "deno lint",
+    "fmt": "deno fmt",
     "db:migrate": "deno run --allow-net --allow-env --allow-read src/db/migrate.ts",
     "db:seed": "deno run --allow-net --allow-env --allow-read src/db/seed.ts"
   },
@@ -13,10 +16,20 @@
     "@std/dotenv": "jsr:@std/dotenv@^0.225.0",
     "postgres": "https://deno.land/x/postgres@v0.19.3/mod.ts",
     "zod": "https://deno.land/x/zod@v3.22.4/mod.ts",
-    "argon2": "https://deno.land/x/argon2@v0.9.2/mod.ts",
+    "argon2": "https://deno.land/x/argon2@v0.10.1/lib/mod.ts",
     "djwt": "https://deno.land/x/djwt@v3.0.2/mod.ts"
   },
   "compilerOptions": {
     "strict": true
+  },
+  "fmt": {
+    "indentWidth": 2,
+    "lineWidth": 100,
+    "singleQuote": false
+  },
+  "lint": {
+    "rules": {
+      "exclude": ["no-explicit-any"]
+    }
   }
 }