feat: Real-time traffic via OLA Maps API with Indian city fallback patterns

fix: ModelWrapper.is_ev enum comparison + improve event publish reliability for real-time SSE (#20)

fix: Critical - Gemini model name (gemini-3-flash-preview → gemini-2.5-flash) + null guard on final_fairness (#19)

fix: Fix IndexError in consolidation engine when pickupLocation is empty

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