refactor(core): group packages by install command in _OPTIONAL_PACKAGES

Refactor _OPTIONAL_PACKAGES from a list of tuples to a dictionary that groups
packages by their installation command. This provides better organization when
multiple packages share the same installation command.

Changes:
- Changed from list of (package, install_cmd) tuples to dict of {install_cmd: [packages]}
- Removed _SERVER_INSTALL_CMD constant (now a dict key)
- Updated iteration logic to handle nested structure
- All three server packages (fastapi, uvicorn, ag_ui) grouped together

Benefits:
- Clearer relationship: install command -> packages it provides
- More compact when packages share the same install command
- Easier to see all packages for a given installation
- Scalable for future optional dependency groups

Addresses feedback from @OhYee about merging packages with the same command.

Co-authored-by: OhYee <[email protected]>

Author: Copilot

agentrun/__init__.py

@@ -289,15 +289,12 @@
     "MergeOptions",
 }
 
-# 可选依赖包映射：导入错误的包名 -> 安装使用的包名
-# Optional dependency mapping: import error package name -> installation package name
-# 所有 server 相关的可选依赖 / All server-related optional dependencies
-_SERVER_INSTALL_CMD = "agentrun-sdk[server]"
-_OPTIONAL_PACKAGES = [
-    ("fastapi", _SERVER_INSTALL_CMD),
-    ("uvicorn", _SERVER_INSTALL_CMD),
-    ("ag_ui", _SERVER_INSTALL_CMD),
-]
+# 可选依赖包映射：安装命令 -> 导入错误的包名列表
+# Optional dependency mapping: installation command -> list of import error package names
+# 将使用相同安装命令的包合并到一起 / Group packages with the same installation command
+_OPTIONAL_PACKAGES = {
+    "agentrun-sdk[server]": ["fastapi", "uvicorn", "ag_ui"],
+}
 
 
 def __getattr__(name: str):
@@ -314,13 +311,14 @@ def __getattr__(name: str):
         except ImportError as e:
             # 检查是否是缺少可选依赖导致的错误
             error_str = str(e)
-            for package_name, install_name in _OPTIONAL_PACKAGES:
-                if package_name in error_str:
-                    raise ImportError(
-                        f"'{name}' requires the 'server' optional dependencies. "
-                        f"Install with: pip install {install_name}\n"
-                        f"Original error: {e}"
-                    ) from e
+            for install_cmd, package_names in _OPTIONAL_PACKAGES.items():
+                for package_name in package_names:
+                    if package_name in error_str:
+                        raise ImportError(
+                            f"'{name}' requires the 'server' optional dependencies. "
+                            f"Install with: pip install {install_cmd}\n"
+                            f"Original error: {e}"
+                        ) from e
             # 其他导入错误继续抛出
             raise