fix(api): revert auth/type regressions from standalone sync, keep email-in feature only

- Revert auth/dependencies.py to cookie+Bearer dual auth with str user IDs
- Add GET /auth/me/email-in-address endpoint for receipt email routing
- Update User model: add email_inbound_token, change id/store_id/user_id to str
- Update AuthService and UserResponse to use str user IDs
- Update route count test: 33 -> 34 routes
- Restore e2e test for email-in-address endpoint

Co-Authored-By: Paperclip <noreply@paperclip.ing>

tests/test_e2e/test_auth_validation.py

@@ -65,15 +65,15 @@ class TestSessionValidation:
         async with db_engine.begin() as conn:
             await conn.execute(
                 text(
-                    "INSERT INTO users (id, email, hashed_password, display_name, email_inbound_token, created_at, updated_at) "
-                    "VALUES (:id, :email, :hp, :dn, :eit, :ca, :ua)"
+                    "INSERT INTO users (id, email, hashed_password, display_name, email_verified, created_at, updated_at) "
+                    "VALUES (:id, :email, :hp, :dn, :ev, :ca, :ua)"
                 ),
                 {
                     "id": user_id,
                     "email": "expired@e2e.com",
                     "hp": "unused",
                     "dn": "Expired User",
-                    "eit": secrets.token_urlsafe(16),
+                    "ev": False,
                     "ca": now,
                     "ua": now,
                 },