fix(deps): Resolve dependency conflicts blocking aiohttp 3.13.3 upgrade

[Copilot]

📝 Description

The aiohttp 3.13.3 upgrade (Dependabot PR) was blocked by pre-existing dependency conflicts in backend/requirements.txt. Fixed two incompatible version constraints:

• google-generativeai: 0.4.0 → 0.3.2 (langchain-google-genai requires <0.4.0)
• redisvl: 0.0.7 → 0.13.2 (old version incompatible with pydantic 2.x)

Both packages tested compatible with backend stack. redisvl not currently imported in codebase.

🔗 Related Issue

Addresses compatibility verification requested in Dependabot PR comments.

🎯 Type of Change

• 🐛 Bug fix (non-breaking change which fixes an issue)
• ✨ New feature (non-breaking change which adds functionality)
• 💥 Breaking change (fix or feature that would cause existing functionality to not work as expected)
• 📚 Documentation update
• 🎨 Code style/refactoring (formatting, renaming, etc.)
• ⚡ Performance improvement
• ✅ Test addition/update
• 🔧 Configuration change
• 🔒 Security fix

🧪 Testing

Test Environment

• Python version: 3.12
• Backend: FastAPI 0.109.0
• Testing: Virtual environment isolation

Test Cases

• All backend modules import successfully
• FastAPI application initializes without errors
• RAG service compatible with updated dependencies
• Verified no direct aiohttp usage in codebase

Manual Testing Steps

1. Created isolated virtual environment
2. Installed updated requirements.txt
3. Verified all backend imports (app.main, app.services.rag, app.routers)
4. Confirmed compatibility with existing code

📸 Screenshots

N/A - Dependency updates only

✅ Checklist

Code Quality

• My code follows the project's coding style
• I have performed a self-review of my code
• I have commented my code where necessary, particularly in complex areas
• My changes generate no new warnings or errors
• I have removed any console.log statements and debugging code

Testing

• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have tested this on multiple browsers (if UI changes)

Documentation

• I have updated the documentation accordingly
• I have updated the README.md if needed
• I have added/updated JSDoc comments for new functions
• I have updated TypeScript types/interfaces

Security & Performance

• My changes don't introduce security vulnerabilities
• I have considered performance implications
• I have handled error cases appropriately
• I have validated user inputs where applicable

Dependencies

• I have updated package.json if adding new dependencies
• I have justified any new dependencies in this PR description
• I have checked that new dependencies don't have known vulnerabilities

Breaking Changes

• This PR does not introduce breaking changes
• OR: I have documented all breaking changes in the description

🔄 Migration Guide

No migration needed - version adjustments maintain compatibility.

💭 Additional Notes

Security benefits from aiohttp 3.13.3:

• CVE-2024-52304 (High severity)
• CVE-2024-42367, CVE-2024-23334, CVE-2024-23829 (Moderate)

Added backend/.gitignore to prevent Python cache file commits.

📋 Reviewer Notes

Verify redisvl 0.13.2 API compatibility if vector search features are planned. Currently unused in codebase.

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For Maintainers

• Code review completed
• Tests passing in CI
• Documentation reviewed
• Ready to merge

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