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/enhance-prompt/routes/enhance.ts

@@ -12,7 +12,10 @@ import { resolveModelString } from '@automaker/model-resolver';
 import { CLAUDE_MODEL_MAP, type ThinkingLevel } from '@automaker/types';
 import { simpleQuery } from '../../../providers/simple-query-service.js';
 import type { SettingsService } from '../../../services/settings-service.js';
-import { getPromptCustomization } from '../../../lib/settings-helpers.js';
+import {
+  getPromptCustomization,
+  getActiveClaudeApiProfile,
+} from '../../../lib/settings-helpers.js';
 import {
   buildUserPrompt,
   isValidEnhancementMode,
@@ -33,6 +36,8 @@ interface EnhanceRequestBody {
   model?: string;
   /** Optional thinking level for Claude models */
   thinkingLevel?: ThinkingLevel;
+  /** Optional project path for per-project Claude API profile */
+  projectPath?: string;
 }
 
 /**
@@ -62,7 +67,7 @@ export function createEnhanceHandler(
 ): (req: Request, res: Response) => Promise<void> {
   return async (req: Request, res: Response): Promise<void> => {
     try {
-      const { originalText, enhancementMode, model, thinkingLevel } =
+      const { originalText, enhancementMode, model, thinkingLevel, projectPath } =
         req.body as EnhanceRequestBody;
 
       // Validate required fields
@@ -126,6 +131,14 @@ export function createEnhanceHandler(
 
       logger.debug(`Using model: ${resolvedModel}`);
 
+      // Get active Claude API profile for alternative endpoint configuration
+      // Uses project-specific profile if projectPath provided, otherwise global
+      const { profile: claudeApiProfile, credentials } = await getActiveClaudeApiProfile(
+        settingsService,
+        '[EnhancePrompt]',
+        projectPath
+      );
+
       // Use simpleQuery - provider abstraction handles routing to correct provider
       // The system prompt is combined with user prompt since some providers
       // don't have a separate system prompt concept
@@ -137,6 +150,8 @@ export function createEnhanceHandler(
         allowedTools: [],
         thinkingLevel,
         readOnly: true, // Prompt enhancement only generates text, doesn't write files
+        claudeApiProfile, // Pass active Claude API profile for alternative endpoint configuration
+        credentials, // Pass credentials for resolving 'credentials' apiKeySource
       });
 
       const enhancedText = result.text;