chore: remove dead code and unused frontend modules

feat(backend): enhance inference pipeline with GLM logic and structured outputs

Handle GPT refusal paths and preserve assessment status

Refine GPT enrichment logic, add relevance badges to UI, and fix minor model/logging issues

GPT reasoning: add in-memory frame encoding, image_b64 support, use gpt-4o-mini for relevance

Update overlays, tracker, GPT reasoning, and threat chat improvements

feat: Add mission-driven object relevance abstractions

fix: Remove chat emojis, improve tracker GPT metadata sync

feat(threat-assessment): implement naval threat analysis with GPT-4o\n\n- Rename utils/gpt_distance.py to utils/gpt_reasoning.py and update logic for 15 naval threat features\n- Add Pydantic schemas for NavalThreatAssessment in utils/schemas.py\n- Update backend (app.py, inference.py) to use new threat estimation and pass full metadata\n- refactor(frontend): render threat level badges and detailed feature table in UI