Update ARCHITECTURE.md and DEPLOIEMENT.md to match actual codebase

- Replace all OpenAI/GPT references with Mistral AI (mistral-small-latest,
  mistral-large-latest) and correct env var names (FILTER_MODEL, SYNTHESIS_MODEL)
- Expand DB schema: add missing columns on ideas/synthesis, add tables
  consultations, consents, ip_abuse with full column list
- Expand API routes table from 5 to 33 routes (admin, consultations,
  contributions, check-law, consent, exports, ip-blacklist)
- Add third AI agent: law-check (LAW_CHECK_PROMPT / POST /api/check-law)
- Expand legal basis from 7 to 16 sources
- Update Vite version: 6 → 7
- Add public pages routing table
- Add autoclose consultation flow diagram (section 4.3)
- Fix security section: replace Azure/OpenAI with Mistral AI
- Update date (April → June 2026), status (Production → Recette)
- Fix DEPLOIEMENT.md diagram: OpenAI API → Mistral AI API

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

DEPLOIEMENT.md

@@ -11,7 +11,7 @@ Internet
    ▼
 [Nginx]  ─── /api/* ──► [Gunicorn + Flask]  ──► [PostgreSQL]
    │                           │
-   └─── /* ──► [React SPA]     └──► [OpenAI API]
+   └─── /* ──► [React SPA]     └──► [Mistral AI API]
                (fichiers statiques)
 ```