fix: allow run without detector and initialize documentation

[trisdoan]

Summary

• Fixed a regression where the tool would fail if no specific detector matched the project layout.
• Initialized comprehensive project documentation in ./docs, covering architecture, standards, and overview.
• Significantly improved README.md with badges, installation instructions, and clearer problem definition.
• Updated .gitignore to exclude project planning files and repomix output.

Test plan

• Verified odoo-addons-path executes correctly in standard and non-standard layouts.
• Validated documentation structure and content.
• Confirmed new README formatting and links.