feat: interface admin regles, refactoring viewer, README, pyproject.toml

- Nouveau module rules_manager.py : CRUD YAML pour les regles metier
- Nouveau blueprint bp_rules.py + template admin_rules.html :
  interface web pour activer/desactiver/ajouter/supprimer des regles
- Extraction helpers.py depuis app.py (filtres Jinja2, statistiques,
  scan dossiers, status systeme) — app.py passe de 1585 a 482 lignes
- Suppression backward-compat re-exports dans cim10_extractor et
  cpam_response (imports corriges dans les tests)
- README.md : architecture, modules, installation, utilisation
- pyproject.toml : dependencies completes, config ruff, pytest, coverage

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

tests/test_medical.py

@@ -3,12 +3,10 @@
 import pytest
 
 from src.config import DossierMedical, Diagnostic, Antecedent, Complication
-from src.medical.cim10_extractor import (
-    extract_medical_info,
-    _lookup_cim10,
-    _is_abnormal,
-    _is_valid_antecedent,
-)
+from src.medical.cim10_extractor import extract_medical_info
+from src.medical.diagnostic_extraction import _lookup_cim10
+from src.medical.bio_normals import _is_abnormal
+from src.medical.cim10_extractor import _is_valid_antecedent
 from src.medical.cim10_dict import normalize_text, load_dict, lookup, reset_cache
 from src.extraction.document_classifier import classify, classify_with_confidence