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_plugin_manager.py

@@ -0,0 +1,15 @@
+"""Import smoke tests for astrbot.core.star.session_plugin_manager."""
+from astrbot.core.star.session_plugin_manager import (
+    SessionPluginSettings,
+    SessionPluginManager,
+)
+
+
+def test_session_plugin_settings_typed_dict():
+    """SessionPluginSettings is importable and is a TypedDict."""
+    assert isinstance(SessionPluginSettings, type)
+
+
+def test_session_plugin_manager_class():
+    """SessionPluginManager is importable and is a class."""
+    assert isinstance(SessionPluginManager, type)