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/suggestions/generate-suggestions.ts

@@ -15,7 +15,11 @@ import { FeatureLoader } from '../../services/feature-loader.js';
 import { getAppSpecPath } from '@automaker/platform';
 import * as secureFs from '../../lib/secure-fs.js';
 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';
 
 const logger = createLogger('Suggestions');
 
@@ -192,6 +196,13 @@ ${prompts.suggestions.baseTemplate}`;
 
   logger.info('[Suggestions] Using model:', model);
 
+  // Get active Claude API profile for alternative endpoint configuration
+  const { profile: claudeApiProfile, credentials } = await getActiveClaudeApiProfile(
+    settingsService,
+    '[Suggestions]',
+    projectPath
+  );
+
   let responseText = '';
 
   // Determine if we should use structured output (Claude supports it, Cursor doesn't)
@@ -223,6 +234,8 @@ Your entire response should be valid JSON starting with { and ending with }. No
     thinkingLevel,
     readOnly: true, // Suggestions 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',