feat(admin): add api client management UI and backend CRUD/rotate endpoints

backend/app/schemas/api_clients.py

@@ -0,0 +1,49 @@
+from datetime import datetime
+
+from pydantic import BaseModel, Field
+
+
+class ApiClientItem(BaseModel):
+    id: str
+    client_key: str
+    name: str
+    status: str
+    allowed_origins: list[str] = Field(default_factory=list)
+    allowed_ips: list[str] = Field(default_factory=list)
+    allowed_paths: list[str] = Field(default_factory=list)
+    rate_limit_per_min: int | None = None
+    expires_at: datetime | None = None
+    last_used_at: datetime | None = None
+    created_at: datetime
+    updated_at: datetime
+
+
+class ApiClientCreateRequest(BaseModel):
+    name: str
+    client_key: str | None = None
+    status: str = "active"
+    allowed_origins: list[str] = Field(default_factory=list)
+    allowed_ips: list[str] = Field(default_factory=list)
+    allowed_paths: list[str] = Field(default_factory=list)
+    rate_limit_per_min: int | None = None
+    expires_at: datetime | None = None
+
+
+class ApiClientUpdateRequest(BaseModel):
+    name: str | None = None
+    status: str | None = None
+    allowed_origins: list[str] | None = None
+    allowed_ips: list[str] | None = None
+    allowed_paths: list[str] | None = None
+    rate_limit_per_min: int | None = None
+    expires_at: datetime | None = None
+
+
+class ApiClientCreateResponse(BaseModel):
+    item: ApiClientItem
+    api_key: str
+
+
+class ApiClientRotateKeyResponse(BaseModel):
+    client_key: str
+    api_key: str