feat(frontend): #50 — validation CGU et politique de confidentialité

- Modale de validation avec chargement des PDF distants, PdfViewPinch et barre de progression latérale (repli PdfView sous Windows).

- Service documents légaux actifs, correction des URLs média, intégration au formulaire de présentation.

- Documentation juridique et réorganisation (archive, index, tickets).

Made-with: Cursor

frontend/pubspec.lock

@@ -57,6 +57,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.0.6"
+  extension:
+    dependency: transitive
+    description:
+      name: extension
+      sha256: be3a6b7f8adad2f6e2e8c63c895d19811fcf203e23466c6296267941d0ff4f24
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.6.0"
   fake_async:
     dependency: transitive
     description:
@@ -113,6 +121,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.9.3+4"
+  fixnum:
+    dependency: transitive
+    description:
+      name: fixnum
+      sha256: b6dc7065e46c974bc7c5f143080a6764ec7a4be6da1285ececdc37be96de53be
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -397,6 +413,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.3.0"
+  pdfx:
+    dependency: "direct main"
+    description:
+      name: pdfx
+      sha256: "29db9b71d46bf2335e001f91693f2c3fbbf0760e4c2eb596bf4bafab211471c1"
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.9.2"
+  photo_view:
+    dependency: transitive
+    description:
+      name: photo_view
+      sha256: "1fc3d970a91295fbd1364296575f854c9863f225505c28c46e0a03e48960c75e"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.15.0"
   platform:
     dependency: transitive
     description:
@@ -514,6 +546,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.4.1"
+  synchronized:
+    dependency: transitive
+    description:
+      name: synchronized
+      sha256: "0669c70faae6270521ee4f05bffd2919892d42d1276e6c495be80174b6bc0ef6"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.3.1"
   term_glyph:
     dependency: transitive
     description:
@@ -538,6 +578,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.4.0"
+  universal_platform:
+    dependency: "direct main"
+    description:
+      name: universal_platform
+      sha256: "64e16458a0ea9b99260ceb5467a214c1f298d647c659af1bff6d3bf82536b1ec"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.0"
   url_launcher:
     dependency: "direct main"
     description:
@@ -602,6 +650,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "3.1.4"
+  uuid:
+    dependency: transitive
+    description:
+      name: uuid
+      sha256: "1fef9e8e11e2991bb773070d4656b7bd5d850967a2456cfc83cf47925ba79489"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.5.3"
   vector_math:
     dependency: transitive
     description: