chore: retire les fichiers parasites du dépôt

- Supprime les 7 logs d'analyse à la racine (analyze_*.txt,
  analysis_report.txt)
- Dé-tracke les données du backend commitées par erreur avant les
  règles gitignore : exports (zips, archives), uploads (photos
  utilisateurs, database.sqlite) — les fichiers restent sur le disque
- Corrige backendia/.gitignore : retire la négation
  !uploads/data/database.sqlite qui ré-incluait la base de données
  utilisateurs, et la règle au chemin erroné au-dessus
- Ajoute les .gitkeep manquants (uploads/images, uploads/data) pour
  préserver la structure des dossiers sur un clone frais

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

backendia/uploads/data/photo-1777554021433-285233602.json

@@ -1,90 +0,0 @@
-{
-  "session_id": "session_1777554006515",
-  "wallet_hash": "cc60fcaa5ef7fdc9be3dd1adba4157fa6dfae2845da45b830b5ef2b7f473d887",
-  "timestamp": "2026-04-30T13:00:06.519693",
-  "device_info": {
-    "model": "google sdk_gphone64_x86_64",
-    "os": "Android 16"
-  },
-  "target_metadata": {
-    "type": "concentric",
-    "distance_meters": 25,
-    "weapon": "Unknown"
-  },
-  "plotting": {
-    "target_corners": [
-      {
-        "norm_x": 0.09999999999999998,
-        "norm_y": 0.09999999999999998
-      },
-      {
-        "norm_x": 0.9,
-        "norm_y": 0.09999999999999998
-      },
-      {
-        "norm_x": 0.9,
-        "norm_y": 0.9
-      },
-      {
-        "norm_x": 0.09999999999999998,
-        "norm_y": 0.9
-      }
-    ],
-    "impacts": [
-      {
-        "id": 1,
-        "label": "bullet_hole",
-        "score": 5,
-        "coords": {
-          "norm_x": 0.267578125,
-          "norm_y": 0.5554741753472222
-        }
-      },
-      {
-        "id": 2,
-        "label": "bullet_hole",
-        "score": 7,
-        "coords": {
-          "norm_x": 0.5712583188657407,
-          "norm_y": 0.3592800564236111
-        }
-      },
-      {
-        "id": 3,
-        "label": "bullet_hole",
-        "score": 4,
-        "coords": {
-          "norm_x": 0.7555239076967593,
-          "norm_y": 0.5703938802083333
-        }
-      },
-      {
-        "id": 4,
-        "label": "bullet_hole",
-        "score": 4,
-        "coords": {
-          "norm_x": 0.6666259765625,
-          "norm_y": 0.6759168836805556
-        }
-      },
-      {
-        "id": 5,
-        "label": "bullet_hole",
-        "score": 9,
-        "coords": {
-          "norm_x": 0.5490415219907407,
-          "norm_y": 0.5212944878472222
-        }
-      },
-      {
-        "id": 6,
-        "label": "bullet_hole",
-        "score": 8,
-        "coords": {
-          "norm_x": 0.4897768373842592,
-          "norm_y": 0.39352756076388895
-        }
-      }
-    ]
-  }
-}