feat: add rate limiting to chat_stream endpoints with slowapi

[jackson-jpeg]

What

Added slowapi rate limiting decorators to chat_stream.py endpoints to protect against token-exhaustion attacks.

Task

Add rate limiting middleware in middleware/security.py using slowapi to protect /api/v1/chat_stream.py endpoints from token-exhaustion attacks

Changes

• backend/app/api/v1/chat_stream.py
• backend/app/api/v1/chat_stream.py
• backend/app/api/v1/chat_stream.py
• backend/app/api/v1/chat_stream.py
• backend/app/api/v1/chat_stream.py
• backend/app/api/v1/chat_stream.py

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