feat(cliproxy): add Claude (Anthropic) OAuth provider support

Add Claude as a first-class OAuth provider in CCS CLI and dashboard.
Backend support already exists in CLIProxyAPIPlus (port 54545).

Changes:
- Add 'claude' to CLIProxyProvider type and profile detector
- Add Claude OAuth config (port 54545, --anthropic-login flag)
- Add Claude to oauth-port-diagnostics flow types
- Add Claude token discovery prefixes (claude-, anthropic-)
- Add Claude model catalog (Opus 4.5, Sonnet 4.5/4, Haiku 4.5)
- Add Claude logo and provider display name
- Update variant config types and adapters

Closes #380

ui/public/assets/providers/claude.svg

@@ -0,0 +1 @@
+<svg height="1em" style="flex:none;line-height:1" viewBox="0 0 24 24" width="1em" xmlns="http://www.w3.org/2000/svg"><title>Claude</title><path d="M4.709 15.955l4.72-2.647.08-.23-.08-.128H9.2l-.79-.048-2.698-.073-2.339-.097-2.266-.122-.571-.121L0 11.784l.055-.352.48-.321.686.06 1.52.103 2.278.158 1.652.097 2.449.255h.389l.055-.157-.134-.098-.103-.097-2.358-1.596-2.552-1.688-1.336-.972-.724-.491-.364-.462-.158-1.008.656-.722.881.06.225.061.893.686 1.908 1.476 2.491 1.833.365.304.145-.103.019-.073-.164-.274-1.355-2.446-1.446-2.49-.644-1.032-.17-.619a2.97 2.97 0 01-.104-.729L6.283.134 6.696 0l.996.134.42.364.62 1.414 1.002 2.229 1.555 3.03.456.898.243.832.091.255h.158V9.01l.128-1.706.237-2.095.23-2.695.08-.76.376-.91.747-.492.584.28.48.685-.067.444-.286 1.851-.559 2.903-.364 1.942h.212l.243-.242.985-1.306 1.652-2.064.73-.82.85-.904.547-.431h1.033l.76 1.129-.34 1.166-1.064 1.347-.881 1.142-1.264 1.7-.79 1.36.073.11.188-.02 2.856-.606 1.543-.28 1.841-.315.833.388.091.395-.328.807-1.969.486-2.309.462-3.439.813-.042.03.049.061 1.549.146.662.036h1.622l3.02.225.79.522.474.638-.079.485-1.215.62-1.64-.389-3.829-.91-1.312-.329h-.182v.11l1.093 1.068 2.006 1.81 2.509 2.33.127.578-.322.455-.34-.049-2.205-1.657-.851-.747-1.926-1.62h-.128v.17l.444.649 2.345 3.521.122 1.08-.17.353-.608.213-.668-.122-1.374-1.925-1.415-2.167-1.143-1.943-.14.08-.674 7.254-.316.37-.729.28-.607-.461-.322-.747.322-1.476.389-1.924.315-1.53.286-1.9.17-.632-.012-.042-.14.018-1.434 1.967-2.18 2.945-1.726 1.845-.414.164-.717-.37.067-.662.401-.589 2.388-3.036 1.44-1.882.93-1.086-.006-.158h-.055L4.132 18.56l-1.13.146-.487-.456.061-.746.231-.243 1.908-1.312-.006.006z" fill="#D97757" fill-rule="nonzero"></path></svg>

ui/src/components/cliproxy/provider-logo.tsx

@@ -20,6 +20,7 @@ const PROVIDER_IMAGES: Record<string, string> = {
   iflow: '/assets/providers/iflow.png',
   kiro: '/assets/providers/kiro.png',
   ghcp: '/assets/providers/copilot.svg',
+  claude: '/assets/providers/claude.svg',
 };
 
 /** Provider color configuration (for fallback only - no background for image logos) */

ui/src/lib/model-catalogs.ts

@@ -311,4 +311,49 @@ export const MODEL_CATALOGS: Record<string, ProviderCatalog> = {
       },
     ],
   },
+  claude: {
+    provider: 'claude',
+    displayName: 'Claude (Anthropic)',
+    defaultModel: 'claude-sonnet-4-5-20250514',
+    models: [
+      {
+        id: 'claude-opus-4-5-20250220',
+        name: 'Claude Opus 4.5',
+        description: 'Most capable Claude model',
+        presetMapping: {
+          default: 'claude-opus-4-5-20250220',
+          opus: 'claude-opus-4-5-20250220',
+          sonnet: 'claude-sonnet-4-5-20250514',
+          haiku: 'claude-haiku-4-5-20250514',
+        },
+      },
+      {
+        id: 'claude-sonnet-4-5-20250514',
+        name: 'Claude Sonnet 4.5',
+        description: 'Balanced performance and speed',
+        presetMapping: {
+          default: 'claude-sonnet-4-5-20250514',
+          opus: 'claude-opus-4-5-20250220',
+          sonnet: 'claude-sonnet-4-5-20250514',
+          haiku: 'claude-haiku-4-5-20250514',
+        },
+      },
+      {
+        id: 'claude-sonnet-4-20250514',
+        name: 'Claude Sonnet 4',
+        description: 'Previous generation Sonnet',
+        presetMapping: {
+          default: 'claude-sonnet-4-20250514',
+          opus: 'claude-opus-4-5-20250220',
+          sonnet: 'claude-sonnet-4-20250514',
+          haiku: 'claude-haiku-4-5-20250514',
+        },
+      },
+      {
+        id: 'claude-haiku-4-5-20250514',
+        name: 'Claude Haiku 4.5',
+        description: 'Fast and efficient',
+      },
+    ],
+  },
 };