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/generate-features-from-spec.ts

@@ -14,7 +14,11 @@ import { streamingQuery } from '../../providers/simple-query-service.js';
 import { parseAndCreateFeatures } from './parse-and-create-features.js';
 import { getAppSpecPath } from '@automaker/platform';
 import type { SettingsService } from '../../services/settings-service.js';
-import { getAutoLoadClaudeMdSetting, getPromptCustomization } from '../../lib/settings-helpers.js';
+import {
+  getAutoLoadClaudeMdSetting,
+  getPromptCustomization,
+  getActiveClaudeApiProfile,
+} from '../../lib/settings-helpers.js';
 import { FeatureLoader } from '../../services/feature-loader.js';
 
 const logger = createLogger('SpecRegeneration');
@@ -123,6 +127,9 @@ Generate ${featureCount} NEW features that build on each other logically. Rememb
 
   logger.info('Using model:', model);
 
+  // Get active Claude API profile for alternative endpoint configuration
+  const claudeApiProfile = await getActiveClaudeApiProfile(settingsService, '[FeatureGeneration]');
+
   // Use streamingQuery with event callbacks
   const result = await streamingQuery({
     prompt,
@@ -134,6 +141,7 @@ Generate ${featureCount} NEW features that build on each other logically. Rememb
     thinkingLevel,
     readOnly: true, // Feature generation only reads code, doesn't write
     settingSources: autoLoadClaudeMd ? ['user', 'project', 'local'] : undefined,
+    claudeApiProfile, // Pass active Claude API profile for alternative endpoint configuration
     onText: (text) => {
       logger.debug(`Feature text block received (${text.length} chars)`);
       events.emit('spec-regeneration:event', {