test: comprehensive test coverage and type fixes

- Add 100+ new test files covering provider sources, platform adapters,
  agent runners, star/plugin system, knowledge base, core utils,
  pipeline, computer tools, builtin commands, and dashboard routes
- Fix Python type errors in sqlite.py (col() wrappers for SQLModel),
  astr_agent_tool_exec, core_lifecycle, star context/manager
- Fix TypeScript strict mode errors across 30+ dashboard Vue files
- Add import smoke tests, auth roundtrip, startup tests
- Add compile-all check and CLI entry test for AUR compatibility
- Restore BotMessageAccumulator and helpers lost in merge

tests/test_session_controller_main.py

@@ -0,0 +1,17 @@
+from __future__ import annotations
+
+from astrbot.api.star import Star
+from astrbot.builtin_stars.session_controller.main import Main
+
+
+def test_session_controller_main_imported():
+    assert Main is not None
+
+
+def test_session_controller_main_class():
+    assert issubclass(Main, Star)
+
+
+def test_session_controller_main_methods():
+    assert hasattr(Main, "handle_session_control_agent")
+    assert hasattr(Main, "handle_empty_mention")