feat: add service token rename command (#40)

* docs: preserve original issue 5 body

* feat: add service token rename command

* test: normalize rich option errors

tests/test_auth.py

@@ -4,6 +4,7 @@ from dataclasses import dataclass
 from datetime import datetime, timezone
 
 from fastapi.testclient import TestClient
+import psycopg.errors
 
 from app.core.auth import AuthContext, Permission
 from app.core.config import Settings
@@ -96,6 +97,7 @@ class _AuthRepo:
         self.tokens: dict[str, AuthToken] = {}
         self._daemons: dict[str, object] = {}
         self._seq = 1
+        self.rename_calls = 0
 
     def get_user_by_username(self, username: str):
         return self.users.get(username)
@@ -105,10 +107,20 @@ class _AuthRepo:
 
     def get_service_token_by_name(self, name: str) -> AuthToken | None:
         for token in self.tokens.values():
-            if token.name == name and token.token_type == "service":
+            if token.name == name and token.token_type == "service" and token.revoked_at is None:
                 return token
         return None
 
+    def rename_service_token(self, name: str, new_name: str) -> AuthToken:
+        self.rename_calls += 1
+        token = self.get_service_token_by_name(name)
+        if token is None:
+            raise ValueError(f"서비스 토큰을 찾을 수 없습니다: {name}")
+        if self.get_service_token_by_name(new_name) is not None:
+            raise psycopg.errors.UniqueViolation("duplicate service-token name")
+        token.name = new_name
+        return token
+
     def create_auth_token(
         self,
         user_id: str,
@@ -231,6 +243,84 @@ def test_revoke_service_token_not_found_raises() -> None:
         raise AssertionError("Expected ValueError for missing service token")
 
 
+def test_rename_service_token_changes_only_name() -> None:
+    from app.domain.models import User
+
+    repo = _AuthRepo()
+    repo.users["alice"] = User(id="user-1", username="alice", permission="read")
+    issued = _service(repo).issue_service_token("old-name", "alice")
+    before = issued.auth_token
+    protected = (
+        before.id,
+        before.user_id,
+        before.token_prefix,
+        before.permission,
+        before.token_type,
+        before.expires_at,
+        before.last_used_at,
+        before.revoked_at,
+        before.created_at,
+        before.runtime_id,
+        before.daemon_id,
+    )
+
+    result = _service(repo).rename_service_token("old-name", "new-name")
+
+    assert result.changed is True
+    assert result.auth_token.name == "new-name"
+    assert repo.get_service_token_by_name("old-name") is None
+    assert repo.get_service_token_by_name("new-name") is result.auth_token
+    assert repo.rename_calls == 1
+    assert protected == (
+        result.auth_token.id,
+        result.auth_token.user_id,
+        result.auth_token.token_prefix,
+        result.auth_token.permission,
+        result.auth_token.token_type,
+        result.auth_token.expires_at,
+        result.auth_token.last_used_at,
+        result.auth_token.revoked_at,
+        result.auth_token.created_at,
+        result.auth_token.runtime_id,
+        result.auth_token.daemon_id,
+    )
+
+
+def test_rename_service_token_same_name_is_noop_without_write() -> None:
+    from app.domain.models import User
+
+    repo = _AuthRepo()
+    repo.users["alice"] = User(id="user-1", username="alice", permission="read")
+    issued = _service(repo).issue_service_token("unchanged", "alice")
+
+    result = _service(repo).rename_service_token("unchanged", "unchanged")
+
+    assert result.changed is False
+    assert result.auth_token is issued.auth_token
+    assert repo.rename_calls == 0
+
+
+def test_rename_service_token_missing_and_duplicate_errors() -> None:
+    from app.domain.models import User
+
+    repo = _AuthRepo()
+    repo.users["alice"] = User(id="user-1", username="alice", permission="read")
+    service = _service(repo)
+    service.issue_service_token("source", "alice")
+    service.issue_service_token("target", "alice")
+
+    for old_name, new_name, message in (
+        ("missing", "new", "서비스 토큰을 찾을 수 없습니다: missing"),
+        ("source", "target", "이미 존재하는 서비스 토큰 이름입니다: target"),
+    ):
+        try:
+            service.rename_service_token(old_name, new_name)
+        except ValueError as exc:
+            assert str(exc) == message
+        else:
+            raise AssertionError("Expected rename failure")
+
+
 # REQ-018: daemon_id forward 보정 (service layer)
 
 def test_issue_service_token_with_daemon_id_stores_it() -> None: