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_send_message_tool.py

@@ -0,0 +1,36 @@
+"""Import smoke tests for send_message tool module."""
+
+import pytest
+
+
+class TestSendMessageToolImports:
+    """Verify send_message.py module can be imported and key classes exist."""
+
+    def test_module_import(self):
+        """Import the module without error."""
+        from astrbot.core.tools import send_message
+        assert send_message is not None
+
+    def test_send_message_to_user_tool(self):
+        """SendMessageToUserTool class is present."""
+        from astrbot.core.tools.send_message import SendMessageToUserTool
+        assert SendMessageToUserTool is not None
+        assert SendMessageToUserTool.name == "send_message_to_user"
+
+    def test_singleton_instance(self):
+        """SEND_MESSAGE_TO_USER_TOOL singleton exists."""
+        from astrbot.core.tools.send_message import SEND_MESSAGE_TO_USER_TOOL
+        from astrbot.core.tools.send_message import SendMessageToUserTool
+        assert isinstance(SEND_MESSAGE_TO_USER_TOOL, SendMessageToUserTool)
+
+    def test_message_component_typed_dict(self):
+        """MessageComponent TypedDict is present."""
+        from astrbot.core.tools.send_message import MessageComponent
+        assert MessageComponent is not None
+
+    def test_get_all_tools(self):
+        """get_all_tools function is present and returns a list."""
+        from astrbot.core.tools.send_message import get_all_tools
+        tools = get_all_tools()
+        assert isinstance(tools, list)
+        assert len(tools) == 1