feat(models): add UserIntegration model, encrypt IMAP passwords, add integrations API
- Add IntegrationDirection/IntegrationType constants and UserIntegration SQLAlchemy model
with owner_id, direction, integration_type, name, config (JSON), credentials (encrypted),
is_active, last_used_at, last_error, created_at, updated_at fields
- Fix UserImapAccount password encryption: encrypt_value() on create/update,
decrypt_value() in IMAP tasks and test-connection endpoint (backward compatible)
- Add Alembic migration 023_add_user_integrations
- Add app/api/integrations.py: CRUD + credentials endpoint with owner-scoped access
- Register integrations router in app/api/__init__.py
- Add 39 tests in tests/test_api_integrations.py covering model, CRUD, encryption
Co-authored-by: christianlouis <361235+christianlouis@users.noreply.github.com>
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