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/main.pyi

@@ -1,109 +0,0 @@
-from typing import Sequence
-from pathlib import Path
-
-import click
-
-
-@click.group()
-def cli() -> None:
-    """doc-forge command-line interface."""
-
-
-@cli.command()
-@click.option(
-    "--modules",
-    multiple=True,
-    help="Python module import paths to introspect",
-)
-@click.option(
-    "--project-name",
-    help="Project name (defaults to first module)",
-)
-def tree(
-    modules: Sequence[str],
-    project_name: str | None,
-) -> None:
-    """Show introspection tree."""
-
-
-@cli.command()
-@click.option(
-    "--module",
-    help="Python module import paths to document",
-)
-@click.option(
-    "--project-name",
-    help="Project name (defaults to first module)",
-)
-@click.option(
-    "--docs-dir",
-    type=click.Path(path_type=Path),
-    default=Path("docs"),
-)
-def generate(
-    module: str,
-    project_name: str | None,
-    docs_dir: Path,
-) -> None:
-    """Generate documentation source files using MkDocs renderer."""
-
-@cli.command(name="generate-mcp")
-@click.option(
-    "--module",
-    required=True,
-    help="Python module import path to document",
-)
-@click.option(
-    "--project-name",
-    help="Project name (defaults to first module)",
-)
-@click.option(
-    "--out-dir",
-    type=click.Path(path_type=Path),
-    default=Path("mcp_docs"),
-)
-def generate_mcp(
-    module: str,
-    project_name: str | None,
-    out_dir: Path,
-) -> None:
-    """
-    Generate MCP-compatible documentation resources for the specified module.
-
-    Args:
-        module: The primary module path to document.
-        project_name: Optional project name override.
-        out_dir: Directory where MCP resources will be written.
-    """
-
-@cli.command()
-@click.option(
-    "--mkdocs-yml",
-    type=click.Path(path_type=Path),
-    default=Path("mkdocs.yml"),
-)
-def build(
-    mkdocs_yml: Path,
-) -> None:
-    """Build documentation using MkDocs."""
-
-
-@cli.command()
-@click.option(
-    "--mkdocs-yml",
-    type=click.Path(path_type=Path),
-    default=Path("mkdocs.yml"),
-)
-def serve(
-    mkdocs_yml: Path,
-) -> None:
-    """Serve documentation using MkDocs."""
-
-
-@cli.command(name="serve-mcp")
-def serve_mcp() -> None:
-    """Serve MCP documentation."""
-
-
-def main() -> None:
-    """CLI entry point."""