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/app-spec/sync-spec.ts

@@ -15,7 +15,10 @@ import { resolvePhaseModel } from '@automaker/model-resolver';
 import { streamingQuery } from '../../providers/simple-query-service.js';
 import { getAppSpecPath } from '@automaker/platform';
 import type { SettingsService } from '../../services/settings-service.js';
-import { getAutoLoadClaudeMdSetting } from '../../lib/settings-helpers.js';
+import {
+  getAutoLoadClaudeMdSetting,
+  getActiveClaudeApiProfile,
+} from '../../lib/settings-helpers.js';
 import { FeatureLoader } from '../../services/feature-loader.js';
 import {
   extractImplementedFeatures,
@@ -157,6 +160,13 @@ export async function syncSpec(
     settings?.phaseModels?.specGenerationModel || DEFAULT_PHASE_MODELS.specGenerationModel;
   const { model, thinkingLevel } = resolvePhaseModel(phaseModelEntry);
 
+  // Get active Claude API profile for alternative endpoint configuration
+  const { profile: claudeApiProfile, credentials } = await getActiveClaudeApiProfile(
+    settingsService,
+    '[SpecSync]',
+    projectPath
+  );
+
   // Use AI to analyze tech stack
   const techAnalysisPrompt = `Analyze this project and return ONLY a JSON object with the current technology stack.
 
@@ -185,6 +195,8 @@ Return ONLY this JSON format, no other text:
       thinkingLevel,
       readOnly: true,
       settingSources: autoLoadClaudeMd ? ['user', 'project', 'local'] : undefined,
+      claudeApiProfile, // Pass active Claude API profile for alternative endpoint configuration
+      credentials, // Pass credentials for resolving 'credentials' apiKeySource
       onText: (text) => {
         logger.debug(`Tech analysis text: ${text.substring(0, 100)}`);
       },