feat: per-provider options (thinking mode, 1M context) and SDK betas integration

- Add ProviderOptionsSection component for per-provider thinking_mode and context_1m
- Store options in options_json column (DB providers) or settings table (env provider)
- Add /api/providers/options GET/PUT route
- Fix SDK integration: use `betas` (not `betaHeaders`) for context-1m-2025-08-07
- ChatView and /chat page always reset thinkingMode on provider change (isolation fix)
- Auto-correct model when switching providers if model not in new provider's list
- Add i18n keys for provider options in both en.ts and zh.ts
- Update test fixtures with options_json field
- Remove unused lastAssistantText variable in claude-client.ts

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/lib/agent-sdk-capabilities.ts

@@ -105,8 +105,11 @@ export async function captureCapabilities(
       conversation.mcpServerStatus(),
     ]);
 
-    cache.models = models.status === 'fulfilled' ? models.value : cache.models;
-    cache.commands = commands.status === 'fulfilled' ? commands.value : cache.commands;
+    // Guard: only overwrite cached models if the new result is non-empty.
+    // An empty array (e.g. transient SDK error) would otherwise wipe valid cached data,
+    // causing models like Opus to disappear from the selector after long idle.
+    cache.models = models.status === 'fulfilled' && models.value.length > 0 ? models.value : cache.models;
+    cache.commands = commands.status === 'fulfilled' && commands.value.length > 0 ? commands.value : cache.commands;
     cache.account = account.status === 'fulfilled' ? account.value : cache.account;
     cache.mcpStatus = mcpStatus.status === 'fulfilled' ? mcpStatus.value : cache.mcpStatus;
     cache.capturedAt = Date.now();

src/lib/claude-client.ts

@@ -20,7 +20,7 @@ import { registerConversation, unregisterConversation } from './conversation-reg
 import { captureCapabilities } from './agent-sdk-capabilities';
 import { getSetting, updateSdkSessionId, createPermissionRequest } from './db';
 import { resolveForClaudeCode, toClaudeCodeEnv } from './provider-resolver';
-import { findClaudeBinary, findGitBash, getExpandedPath } from './platform';
+import { findClaudeBinary, findGitBash, getExpandedPath, invalidateClaudePathCache } from './platform';
 import { notifyPermissionRequest, notifyGeneric } from './telegram-bot';
 import os from 'os';
 import fs from 'fs';
@@ -95,6 +95,15 @@ function findClaudePath(): string | undefined {
   return found;
 }
 
+/**
+ * Invalidate the cached Claude binary path in this module AND in platform.ts.
+ * Must be called after installation so the next SDK call picks up the new binary.
+ */
+export function invalidateClaudeClientCache(): void {
+  cachedClaudePath = undefined; // reset to "not yet looked up"
+  invalidateClaudePathCache();  // also reset the 60s TTL cache in platform.ts
+}
+
 /**
  * Convert our MCPServerConfig to the SDK's McpServerConfig format.
  * Supports stdio, sse, and http transport types.
@@ -383,6 +392,7 @@ export function streamClaude(options: ClaudeStreamOptions): ReadableStream<strin
     agent,
     enableFileCheckpointing,
     autoTrigger,
+    context1m,
   } = options;
 
   return new ReadableStream<string>({
@@ -516,6 +526,12 @@ export function streamClaude(options: ClaudeStreamOptions): ReadableStream<strin
         if (enableFileCheckpointing) {
           queryOptions.enableFileCheckpointing = true;
         }
+        if (context1m) {
+          queryOptions.betas = [
+            ...(queryOptions.betas || []),
+            'context-1m-2025-08-07',
+          ];
+        }
 
         // Resume session if we have an SDK session ID from a previous conversation turn.
         // Pre-check: verify working_directory exists before attempting resume.
@@ -767,7 +783,6 @@ export function streamClaude(options: ClaudeStreamOptions): ReadableStream<strin
           console.warn('[claude-client] Capability capture failed:', err);
         });
 
-        let lastAssistantText = '';
         let tokenUsage: TokenUsage | null = null;
         // Track pending TodoWrite tool_use_ids so we can sync after successful execution
         const pendingTodoWrites = new Map<string, Array<{ content: string; status: string; activeForm?: string }>>();
@@ -781,11 +796,7 @@ export function streamClaude(options: ClaudeStreamOptions): ReadableStream<strin
             case 'assistant': {
               const assistantMsg = message as SDKAssistantMessage;
               // Text deltas are handled by stream_event for real-time streaming.
-              // Only track lastAssistantText here and process tool_use blocks.
-              const text = extractTextFromMessage(assistantMsg);
-              if (text) {
-                lastAssistantText = text;
-              }
+              // Here we only process tool_use blocks.
 
               // Check for tool use blocks
               for (const block of assistantMsg.message.content) {

src/lib/provider-catalog.ts

@@ -250,12 +250,16 @@ export const VENDOR_PRESETS: VendorPreset[] = [
     description: 'MiniMax Code Plan — China region',
     descriptionZh: 'MiniMax 编程套餐 — 中国区',
     protocol: 'anthropic',
-    authStyle: 'api_key',
-    baseUrl: 'https://api.minimaxi.com/anthropic',
+    authStyle: 'auth_token',
+    baseUrl: 'https://api.minimaxi.com/anthropic/v1',
     defaultEnvOverrides: {
       API_TIMEOUT_MS: '3000000',
       CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC: '1',
-      ANTHROPIC_API_KEY: '',
+      ANTHROPIC_AUTH_TOKEN: '',
+      ANTHROPIC_MODEL: 'MiniMax-M2.5',
+      ANTHROPIC_DEFAULT_SONNET_MODEL: 'MiniMax-M2.5',
+      ANTHROPIC_DEFAULT_OPUS_MODEL: 'MiniMax-M2.5',
+      ANTHROPIC_DEFAULT_HAIKU_MODEL: 'MiniMax-M2.5',
     },
     defaultModels: [
       { modelId: 'sonnet', displayName: 'MiniMax-M2.5', role: 'default' },
@@ -272,12 +276,16 @@ export const VENDOR_PRESETS: VendorPreset[] = [
     description: 'MiniMax Code Plan — Global region',
     descriptionZh: 'MiniMax 编程套餐 — 国际区',
     protocol: 'anthropic',
-    authStyle: 'api_key',
+    authStyle: 'auth_token',
     baseUrl: 'https://api.minimax.io/anthropic',
     defaultEnvOverrides: {
       API_TIMEOUT_MS: '3000000',
       CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC: '1',
-      ANTHROPIC_API_KEY: '',
+      ANTHROPIC_AUTH_TOKEN: '',
+      ANTHROPIC_MODEL: 'MiniMax-M2.5',
+      ANTHROPIC_DEFAULT_SONNET_MODEL: 'MiniMax-M2.5',
+      ANTHROPIC_DEFAULT_OPUS_MODEL: 'MiniMax-M2.5',
+      ANTHROPIC_DEFAULT_HAIKU_MODEL: 'MiniMax-M2.5',
     },
     defaultModels: [
       { modelId: 'sonnet', displayName: 'MiniMax-M2.5', role: 'default' },
@@ -495,6 +503,18 @@ export function findPresetForLegacy(baseUrl: string, providerType: string): Vend
   if (baseUrl) {
     const match = VENDOR_PRESETS.find(p => p.baseUrl === baseUrl);
     if (match) return match;
+
+    // Fuzzy match: legacy entries may have old URLs (e.g. minimaxi.com/anthropic
+    // before /v1 suffix was added). Match by domain substring against presets.
+    const urlLower = baseUrl.toLowerCase();
+    const fuzzy = VENDOR_PRESETS.find(p => {
+      if (!p.baseUrl) return false;
+      try {
+        const presetHost = new URL(p.baseUrl).hostname;
+        return urlLower.includes(presetHost);
+      } catch { return false; }
+    });
+    if (fuzzy) return fuzzy;
   }
 
   // Type-based fallback