feat: add plugin framework with UI contributions and suite selection

- Implemented PluginBlocks component to render various plugin UI elements.
- Created SuitePicker for selecting test suites and questions.
- Introduced usePluginUI hook for managing plugin UI state and manifest.
- Developed DocsPage for comprehensive plugin framework documentation.
- Added PluginPage to render pages declared by plugins based on the current path.

server/core_bridge.py

@@ -55,6 +55,22 @@ from settings import (  # type: ignore[import-not-found]
     save_settings,
     set_local_model_paths,
 )
+from suites import (  # type: ignore[import-not-found]
+    ReadOnlySuiteError,
+    Suite,
+    SuiteError,
+    create_suite,
+    delete_suite,
+    duplicate_suite,
+    find_prompts,
+    get_suite,
+    list_suites,
+    load_prompts,
+    load_suite_prompts,
+    save_suite_tests,
+    split_question_id,
+    update_suite,
+)
 
 __all__ = [
     "CORE_DIR",
@@ -83,6 +99,20 @@ __all__ = [
     "list_provider_names",
     "load_settings",
     "load_test_prompts",
+    "ReadOnlySuiteError",
+    "Suite",
+    "SuiteError",
+    "create_suite",
+    "delete_suite",
+    "duplicate_suite",
+    "find_prompts",
+    "get_suite",
+    "list_suites",
+    "load_prompts",
+    "load_suite_prompts",
+    "save_suite_tests",
+    "split_question_id",
+    "update_suite",
     "run_suite",
     "sanitize_model_name",
     "save_settings",