feat: embed a Flutter G4F client with Cronet, cookie jar, and origin WebView

Port the Oracle off the Python g4f container onto on-device providers: Chromium HTTP via Cronet, a shared cookie session, IterList retry, hosted OpenAI-compat aggregators, and same-origin WebView fallbacks instead of CORS fetch.

pubspec.lock

@@ -1,6 +1,14 @@
 # Generated by pub
 # See https://dart.dev/tools/pub/glossary#lockfile
 packages:
+  args:
+    dependency: transitive
+    description:
+      name: args
+      sha256: d0481093c50b1da8910eb0bb301626d4d8eb7284aa739614d2b394ee09e3ea04
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.7.0"
   async:
     dependency: transitive
     description:
@@ -41,6 +49,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.19.1"
+  cronet_http:
+    dependency: "direct main"
+    description:
+      name: cronet_http
+      sha256: "1b99ad5ae81aa9d2f12900e5f17d3681f3828629bb7f7fe7ad88076a34209840"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.5.0"
+  crypto:
+    dependency: "direct main"
+    description:
+      name: crypto
+      sha256: c8ea0233063ba03258fbcf2ca4d6dadfefe14f02fab57702265467a19f27fadf
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.0.7"
   cupertino_icons:
     dependency: "direct main"
     description:
@@ -73,11 +97,83 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "7.0.1"
+  fixnum:
+    dependency: transitive
+    description:
+      name: fixnum
+      sha256: b6dc7065e46c974bc7c5f143080a6764ec7a4be6da1285ececdc37be96de53be
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.1"
   flutter:
     dependency: "direct main"
     description: flutter
     source: sdk
     version: "0.0.0"
+  flutter_inappwebview:
+    dependency: "direct main"
+    description:
+      name: flutter_inappwebview
+      sha256: "80092d13d3e29b6227e25b67973c67c7210bd5e35c4b747ca908e31eb71a46d5"
+      url: "https://pub.dev"
+    source: hosted
+    version: "6.1.5"
+  flutter_inappwebview_android:
+    dependency: transitive
+    description:
+      name: flutter_inappwebview_android
+      sha256: "62557c15a5c2db5d195cb3892aab74fcaec266d7b86d59a6f0027abd672cddba"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.3"
+  flutter_inappwebview_internal_annotations:
+    dependency: transitive
+    description:
+      name: flutter_inappwebview_internal_annotations
+      sha256: e30fba942e3debea7b7e6cdd4f0f59ce89dd403a9865193e3221293b6d1544c6
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.0"
+  flutter_inappwebview_ios:
+    dependency: transitive
+    description:
+      name: flutter_inappwebview_ios
+      sha256: "5818cf9b26cf0cbb0f62ff50772217d41ea8d3d9cc00279c45f8aabaa1b4025d"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.2"
+  flutter_inappwebview_macos:
+    dependency: transitive
+    description:
+      name: flutter_inappwebview_macos
+      sha256: c1fbb86af1a3738e3541364d7d1866315ffb0468a1a77e34198c9be571287da1
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.2"
+  flutter_inappwebview_platform_interface:
+    dependency: transitive
+    description:
+      name: flutter_inappwebview_platform_interface
+      sha256: cf5323e194096b6ede7a1ca808c3e0a078e4b33cc3f6338977d75b4024ba2500
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.3.0+1"
+  flutter_inappwebview_web:
+    dependency: transitive
+    description:
+      name: flutter_inappwebview_web
+      sha256: "55f89c83b0a0d3b7893306b3bb545ba4770a4df018204917148ebb42dc14a598"
+      url: "https://pub.dev"
+    source: hosted
+    version: "1.1.2"
+  flutter_inappwebview_windows:
+    dependency: transitive
+    description:
+      name: flutter_inappwebview_windows
+      sha256: "8b4d3a46078a2cdc636c4a3d10d10f2a16882f6be607962dbfff8874d1642055"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.6.0"
   flutter_lints:
     dependency: "direct dev"
     description:
@@ -112,6 +208,22 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "4.1.2"
+  http_profile:
+    dependency: transitive
+    description:
+      name: http_profile
+      sha256: "7e679e355b09aaee2ab5010915c932cce3f2d1c11c3b2dc177891687014ffa78"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.0"
+  jni:
+    dependency: transitive
+    description:
+      name: jni
+      sha256: d2c361082d554d4593c3012e26f6b188f902acd291330f13d6427641a92b3da1
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.14.2"
   leak_tracker:
     dependency: transitive
     description:
@@ -168,6 +280,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.18.0"
+  package_config:
+    dependency: transitive
+    description:
+      name: package_config
+      sha256: f096c55ebb7deb7e384101542bfba8c52696c1b56fca2eb62827989ef2353bbc
+      url: "https://pub.dev"
+    source: hosted
+    version: "2.2.0"
   path:
     dependency: transitive
     description:
@@ -333,6 +453,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.4.0"
+  uuid:
+    dependency: "direct main"
+    description:
+      name: uuid
+      sha256: "9b129329f58692f6e6578329498a8fe9fbe98f090beb764ffbb8ee2eadd01dcd"
+      url: "https://pub.dev"
+    source: hosted
+    version: "4.6.0"
   vector_math:
     dependency: transitive
     description: