Phase 3.1: Remove flutter_bloc + equatable, delete old bloc files

- Remove flutter_bloc and equatable dependencies from both apps
- Delete all 10 old bloc files (5 per app)
- Fix 6 remaining screens that used context.read<ApiClient>() from
  flutter_bloc → converted to ConsumerStatefulWidget/ConsumerWidget
  with ref.read(apiClientProvider)
- Both apps now use Riverpod exclusively for state management

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

client_app/pubspec.lock

@@ -49,14 +49,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.13.1"
-  bloc:
-    dependency: transitive
-    description:
-      name: bloc
-      sha256: "106842ad6569f0b60297619e9e0b1885c2fb9bf84812935490e6c5275777804e"
-      url: "https://pub.dev"
-    source: hosted
-    version: "8.1.4"
   boolean_selector:
     dependency: transitive
     description:
@@ -265,14 +257,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.1.2"
-  equatable:
-    dependency: "direct main"
-    description:
-      name: equatable
-      sha256: "3e0141505477fd8ad55d6eb4e7776d3fe8430be8e497ccb1521370c3f21a3e2b"
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.8"
   fake_async:
     dependency: transitive
     description:
@@ -382,14 +366,6 @@ packages:
     description: flutter
     source: sdk
     version: "0.0.0"
-  flutter_bloc:
-    dependency: "direct main"
-    description:
-      name: flutter_bloc
-      sha256: b594505eac31a0518bdcb4b5b79573b8d9117b193cc80cc12e17d639b10aa27a
-      url: "https://pub.dev"
-    source: hosted
-    version: "8.1.6"
   flutter_hooks:
     dependency: "direct main"
     description:
@@ -680,14 +656,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "2.0.0"
-  nested:
-    dependency: transitive
-    description:
-      name: nested
-      sha256: "03bac4c528c64c95c722ec99280375a6f2fc708eec17c7b3f07253b626cd2a20"
-      url: "https://pub.dev"
-    source: hosted
-    version: "1.0.0"
   package_config:
     dependency: transitive
     description:
@@ -760,14 +728,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.5.2"
-  provider:
-    dependency: transitive
-    description:
-      name: provider
-      sha256: "4e82183fa20e5ca25703ead7e05de9e4cceed1fbd1eadc1ac3cb6f565a09f272"
-      url: "https://pub.dev"
-    source: hosted
-    version: "6.1.5+1"
   pub_semver:
     dependency: transitive
     description: