feat: reorganize admin panel around accounts

backend/app/schemas/admin.py

@@ -28,6 +28,62 @@ class ActivityEntry(BaseModel):
         from_attributes = True
 
 
+# --- Admin Accounts & People Search ---
+
+class AdminUserListItem(BaseModel):
+    id: UUID
+    email: EmailStr
+    name: str
+    role: str
+    is_super_admin: bool = False
+    is_active: bool = True
+    account_id: Optional[UUID] = None
+    account_role: Optional[str] = None
+    account_name: Optional[str] = None
+    account_display_code: Optional[str] = None
+    created_at: datetime
+    last_login: Optional[datetime] = None
+    deleted_at: Optional[datetime] = None
+
+
+class AdminUserListResponse(BaseModel):
+    items: list[AdminUserListItem]
+    total: int
+    page: int
+    per_page: int
+
+
+class AdminAccountMember(BaseModel):
+    id: UUID
+    email: EmailStr
+    name: str
+    role: str
+    is_super_admin: bool = False
+    is_active: bool = True
+    account_role: Optional[str] = None
+    created_at: datetime
+    last_login: Optional[datetime] = None
+    deleted_at: Optional[datetime] = None
+
+
+class AdminAccountListItem(BaseModel):
+    id: UUID
+    name: str
+    display_code: str
+    created_at: datetime
+    owner_id: Optional[UUID] = None
+    member_count: int = 0
+    active_member_count: int = 0
+    members: list[AdminAccountMember] = Field(default_factory=list)
+
+
+class AdminAccountListResponse(BaseModel):
+    items: list[AdminAccountListItem]
+    total: int
+    page: int
+    per_page: int
+
+
 # --- Audit Logs ---
 
 class AuditLogEntry(BaseModel):