feat: unified Claude API key and profile system with z.AI, MiniMax, OpenRouter support (#600)

* feat: add Claude API provider profiles for alternative endpoints

Add support for managing multiple Claude-compatible API endpoints
(z.AI GLM, AWS Bedrock, etc.) through provider profiles in settings.

Features:
- New ClaudeApiProfile type with base URL, API key, model mappings
- Pre-configured z.AI GLM template with correct model names
- Profile selector in Settings > Claude > API Profiles
- Clean switching between profiles and direct Anthropic API
- Immediate persistence to prevent data loss on restart

Profile support added to all execution paths:
- Agent service (chat)
- Ideation service
- Auto-mode service (feature agents, enhancements)
- Simple query service (title generation, descriptions, etc.)
- Backlog planning, commit messages, spec generation
- GitHub issue validation, suggestions

Environment variables set when profile is active:
- ANTHROPIC_BASE_URL, ANTHROPIC_AUTH_TOKEN/API_KEY
- ANTHROPIC_DEFAULT_HAIKU/SONNET/OPUS_MODEL
- API_TIMEOUT_MS, CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC

apps/server/src/routes/github/routes/validate-issue.ts

@@ -34,7 +34,11 @@ import {
   ValidationComment,
   ValidationLinkedPR,
 } from './validation-schema.js';
-import { getPromptCustomization } from '../../../lib/settings-helpers.js';
+import {
+  getPromptCustomization,
+  getAutoLoadClaudeMdSetting,
+  getActiveClaudeApiProfile,
+} from '../../../lib/settings-helpers.js';
 import {
   trySetValidationRunning,
   clearValidationStatus,
@@ -43,7 +47,6 @@ import {
   logger,
 } from './validation-common.js';
 import type { SettingsService } from '../../../services/settings-service.js';
-import { getAutoLoadClaudeMdSetting } from '../../../lib/settings-helpers.js';
 
 /**
  * Request body for issue validation
@@ -166,6 +169,13 @@ ${basePrompt}`;
 
     logger.info(`Using model: ${model}`);
 
+    // Get active Claude API profile for alternative endpoint configuration
+    const { profile: claudeApiProfile, credentials } = await getActiveClaudeApiProfile(
+      settingsService,
+      '[IssueValidation]',
+      projectPath
+    );
+
     // Use streamingQuery with event callbacks
     const result = await streamingQuery({
       prompt: finalPrompt,
@@ -177,6 +187,8 @@ ${basePrompt}`;
       reasoningEffort: effectiveReasoningEffort,
       readOnly: true, // Issue validation only reads code, doesn't write
       settingSources: autoLoadClaudeMd ? ['user', 'project', 'local'] : undefined,
+      claudeApiProfile, // Pass active Claude API profile for alternative endpoint configuration
+      credentials, // Pass credentials for resolving 'credentials' apiKeySource
       outputFormat: useStructuredOutput
         ? {
             type: 'json_schema',