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_pdf_parser.py

@@ -0,0 +1,13 @@
+"""Import smoke tests for the PDF parser module."""
+
+from __future__ import annotations
+
+from astrbot.core.knowledge_base.parsers.pdf_parser import PDFParser
+
+
+class TestPDFParserImports:
+    """Verify that the main class from pdf_parser can be imported."""
+
+    def test_import_pdf_parser(self):
+        assert PDFParser is not None
+        assert hasattr(PDFParser, "parse")