refactor: restructure CLI and improve documentation/typing

- Consolidated CLI commands into [build](cci:1://file:///c:/Users/vishe/WorkSpace/code/aetos/doc-forge/docforge/cli/mkdocs/logic.py:48:0-58:46) and [serve](cci:1://file:///c:/Users/vishe/WorkSpace/code/aetos/doc-forge/docforge/cli/commands.py:70:0-92:32) using `--mkdocs` and `--mcp` flags.
- Separated CLI orchestration logic into [docforge/cli/mkdocs/logic.py](cci:7://file:///c:/Users/vishe/WorkSpace/code/aetos/doc-forge/docforge/cli/mkdocs/logic.py:0:0-0:0) and [docforge/cli/mcp/logic.py](cci:7://file:///c:/Users/vishe/WorkSpace/code/aetos/doc-forge/docforge/cli/mcp/logic.py:0:0-0:0).
- Moved command definitions to [docforge/cli/commands.py](cci:7://file:///c:/Users/vishe/WorkSpace/code/aetos/doc-forge/docforge/cli/commands.py:0:0-0:0), making [main.py](cci:7://file:///c:/Users/vishe/WorkSpace/code/aetos/doc-forge/docforge/cli/main.py:0:0-0:0) a thin entry point.
- Aligned [.pyi](cci:7://file:///c:/Users/vishe/WorkSpace/code/aetos/doc-forge/docforge/cli/main.pyi:0:0-0:0) type stubs with [.py](cci:7://file:///c:/Users/vishe/WorkSpace/code/aetos/doc-forge/tests/conftest.py:0:0-0:0) implementations across the package.
- Added missing docstrings to internal helper functions and core classes.
- Restructured tests into `tests/mkdocs/` and `tests/mcp/`.
- Updated navigation specification to reflect the new project structure.

docforge/cli/mkdocs/logic.py

@@ -0,0 +1,69 @@
+from pathlib import Path
+from importlib import resources
+import click
+import yaml
+from docforge.loaders import GriffeLoader, discover_module_paths
+from docforge.renderers import MkDocsRenderer
+from docforge.nav import load_nav_spec, resolve_nav, MkDocsNavEmitter
+
+def generate_sources(module: str, project_name: str | None, docs_dir: Path) -> None:
+    """
+    Generate Markdown source files for the specified module.
+    """
+    loader = GriffeLoader()
+    discovered_paths = discover_module_paths(module)
+    project = loader.load_project(discovered_paths, project_name)
+
+    renderer = MkDocsRenderer()
+    renderer.generate_sources(project, docs_dir)
+
+def generate_config(docs_dir: Path, nav_file: Path, template: Path | None, out: Path, site_name: str) -> None:
+    """
+    Generate an mkdocs.yml configuration file.
+    """
+    if not nav_file.exists():
+        raise click.FileError(str(nav_file), hint="Nav spec not found")
+
+    spec = load_nav_spec(nav_file)
+    resolved = resolve_nav(spec, docs_dir)
+    nav_block = MkDocsNavEmitter().emit(resolved)
+
+    # Load template
+    if template is not None:
+        if not template.exists():
+            raise click.FileError(str(template), hint="Template not found")
+        data = yaml.safe_load(template.read_text(encoding="utf-8"))
+    else:
+        text = (
+            resources.files("docforge.templates")
+            .joinpath("mkdocs.sample.yml")
+            .read_text(encoding="utf-8")
+        )
+        data = yaml.safe_load(text)
+
+    data["site_name"] = site_name
+    data["nav"] = nav_block
+
+    out.write_text(yaml.safe_dump(data, sort_keys=False), encoding="utf-8")
+
+def build(mkdocs_yml: Path) -> None:
+    """
+    Build the documentation site using MkDocs.
+    """
+    if not mkdocs_yml.exists():
+        raise click.ClickException(f"mkdocs.yml not found: {mkdocs_yml}")
+
+    from mkdocs.config import load_config
+    from mkdocs.commands.build import build as mkdocs_build
+
+    mkdocs_build(load_config(str(mkdocs_yml)))
+
+def serve(mkdocs_yml: Path) -> None:
+    """
+    Serve the documentation site with live-reload using MkDocs.
+    """
+    if not mkdocs_yml.exists():
+        raise click.ClickException(f"mkdocs.yml not found: {mkdocs_yml}")
+
+    from mkdocs.commands.serve import serve as mkdocs_serve
+    mkdocs_serve(config_file=str(mkdocs_yml))