Initial commit: HR Performance System

- Database schema with 31 tables for 4-card system
- LLM API integration (Gemini, DeepSeek, OpenAI)
- Error handling system with modal component
- Connection test UI for LLM services
- Environment configuration files
- Complete database documentation

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

config/llm.config.js

@@ -0,0 +1,77 @@
+/**
+ * LLM API Configuration
+ * 支援 Gemini, DeepSeek, OpenAI 三種 LLM 服務
+ */
+
+require('dotenv').config();
+
+const llmConfig = {
+  // Gemini Configuration
+  gemini: {
+    apiKey: process.env.GEMINI_API_KEY,
+    model: process.env.GEMINI_MODEL || 'gemini-pro',
+    apiUrl: 'https://generativelanguage.googleapis.com/v1beta',
+    enabled: !!process.env.GEMINI_API_KEY,
+    timeout: 30000, // 30 seconds
+  },
+
+  // DeepSeek Configuration
+  deepseek: {
+    apiKey: process.env.DEEPSEEK_API_KEY,
+    apiUrl: process.env.DEEPSEEK_API_URL || 'https://api.deepseek.com/v1',
+    model: process.env.DEEPSEEK_MODEL || 'deepseek-chat',
+    enabled: !!process.env.DEEPSEEK_API_KEY,
+    timeout: 30000,
+  },
+
+  // OpenAI Configuration
+  openai: {
+    apiKey: process.env.OPENAI_API_KEY,
+    apiUrl: process.env.OPENAI_API_URL || 'https://api.openai.com/v1',
+    model: process.env.OPENAI_MODEL || 'gpt-4',
+    enabled: !!process.env.OPENAI_API_KEY,
+    timeout: 30000,
+  },
+
+  // Default LLM Provider
+  defaultProvider: 'gemini',
+
+  // Common Settings
+  maxTokens: 2000,
+  temperature: 0.7,
+};
+
+/**
+ * 取得啟用的 LLM 服務清單
+ */
+function getEnabledProviders() {
+  const enabled = [];
+  if (llmConfig.gemini.enabled) enabled.push('gemini');
+  if (llmConfig.deepseek.enabled) enabled.push('deepseek');
+  if (llmConfig.openai.enabled) enabled.push('openai');
+  return enabled;
+}
+
+/**
+ * 取得指定 LLM 服務的設定
+ */
+function getProviderConfig(provider) {
+  if (!llmConfig[provider]) {
+    throw new Error(`Unknown LLM provider: ${provider}`);
+  }
+  return llmConfig[provider];
+}
+
+/**
+ * 檢查 LLM 服務是否可用
+ */
+function isProviderEnabled(provider) {
+  return llmConfig[provider]?.enabled || false;
+}
+
+module.exports = {
+  llmConfig,
+  getEnabledProviders,
+  getProviderConfig,
+  isProviderEnabled,
+};