refactor: add markdown frontend

pyproject.toml

@@ -7,6 +7,7 @@ authors = [
 ]
 requires-python = ">=3.13"
 dependencies = [
+    "aiofile>=3.11.1",
     "aiohttp>=3.13.5",
     "aiosqlite>=0.22.1",
     "anthropic>=0.103.0",
@@ -20,6 +21,7 @@ dependencies = [
     "psycopg[binary]>=3.3.4",
     "pydantic>=2.13.4",
     "pydantic-settings>=2.14.1",
+    "python-frontmatter>=1.2.0",
     "sqlmodel>=0.0.38",
     "uvicorn[standard]>=0.47.0",
     "uvloop>=0.22.1",