[Security] Rate limiting only covers 1 of 6 AI endpoints - apply to all

[sanrishi]

Target

\�ackend/routers/ai.py: All AI analysis endpoints (6 endpoints unprotected)
\�ackend/routers/tickets.py: Ticket read/write endpoints (0 rate limited)
\�ackend/routers/admin.py: Admin endpoints (0 rate limited)

Vector

Insecure Deserialization & Payload Validation (Security)

Problem

Only /ai/analyze_ticket\ had rate limiting. Five other AI endpoints — including SSE streaming, Gemini-powered analysis, and V2 classification — had zero protection. Ticket and admin endpoints were also completely open.

The \limiter.py\ module already defined all limit constants (\ML_HEAVY_LIMIT, \ML_LIGHT_LIMIT, \TICKET_READ_LIMIT, \TICKET_WRITE_LIMIT, \ADMIN_LIMIT) but they were never applied to the actual route decorators.

Changes

• Added @limiter.limit(ML_HEAVY_LIMIT)\ to 6 AI endpoints (troubleshoot, analyze_bug, analyze, analyze_stream, legacy, analyze-v2)
• Added @limiter.limit(TICKET_READ_LIMIT)\ and \TICKET_WRITE_LIMIT\ to tickets endpoints
• Added @limiter.limit(ADMIN_LIMIT)\ to admin endpoints
• Fixed parameter name collisions (renamed
  equest\ → \ roubleshoot_request/etc. to avoid conflict with FastAPI \Request\ injection)

Fixes #2874

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