Implement JWT authentication for streaming endpoints

Overview

Adds JWT authentication middleware to all streaming service endpoints.

Changes

• Created JwtAuthFilter to intercept and validate JWT tokens
• Integrates with auth-service for token verification
• Returns 401 for missing or invalid tokens

Dependencies

• Depends on auth-service JWT validation endpoint
• Requires Bearer token in Authorization header

Testing

• Manual testing with valid/invalid tokens
• Integration testing with auth-service

Closes #1

@stanhu Can you review the filter implementation?