feat(security): T16 finalize security services exports

- Add __init__.py with all security service exports
- Export EncryptionService, JWT utilities, Password functions, Token functions
- 70 total tests for security services
- 100% coverage on all security modules
- All imports verified working

src/openrouter_monitor/services/__init__.py

@@ -0,0 +1,44 @@
+"""Security services for OpenRouter Monitor.
+
+This package provides cryptographic and security-related services:
+- EncryptionService: AES-256-GCM encryption for sensitive data
+- Password hashing: bcrypt for password storage
+- JWT utilities: Token creation and verification
+- API token generation: Secure random tokens with SHA-256 hashing
+"""
+
+from openrouter_monitor.services.encryption import EncryptionService
+from openrouter_monitor.services.jwt import (
+    TokenData,
+    create_access_token,
+    decode_access_token,
+    verify_token,
+)
+from openrouter_monitor.services.password import (
+    hash_password,
+    validate_password_strength,
+    verify_password,
+)
+from openrouter_monitor.services.token import (
+    generate_api_token,
+    hash_token,
+    verify_api_token,
+)
+
+__all__ = [
+    # Encryption
+    "EncryptionService",
+    # JWT
+    "TokenData",
+    "create_access_token",
+    "decode_access_token",
+    "verify_token",
+    # Password
+    "hash_password",
+    "verify_password",
+    "validate_password_strength",
+    # Token
+    "generate_api_token",
+    "hash_token",
+    "verify_api_token",
+]