style(admin): add (Optional) to proxy labels, update field placeholders, and fix brand logo aspect ratio (v1.2.53)

[Foshati]

• Added (Optional) to all Proxy field labels in admin manifest.\n- Added descriptive placeholders for Proxy inputs (Optional - leave empty for direct connection) and API key inputs (Not configured - enter API Key).\n- Fixed logo scaling and aspect ratio in admin.css (object-fit: contain) so <C codefa logo renders without clipping or distortion.\n- Bumped version to v1.2.53.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 7b199de and dc12cba.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• pyproject.toml
• src/codefa/api/admin_static/admin.css
• src/codefa/api/admin_static/admin.js
• src/codefa/config/admin/provider_manifest.py

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