Refactor LLM verification and update dependencies

- Removed OpenAI and related dependencies from package.json and package-lock.json.
- Simplified LLM verification logic to focus on OpenCode server.
- Updated tests to reflect changes in LLM provider handling.
- Added CI and CD workflows for automated processes in Gitea.

app/config.js

@@ -13,31 +13,18 @@ export const PR_BASE_BRANCH = process.env.PR_BASE_BRANCH || '';
 export const FINDINGS_PATH = '.gitea/ai-review/findings.json';
 export const EXCLUSIONS_PATH = '.gitea/ai-review/exclusions.json';
 
-export function shouldSkipOpenCodeTLSVerify() {
-  return process.env.OPENCODE_SKIP_TLS_VERIFY !== 'false';
-}
-
 export function getOpenCodeHttpsAgent() {
-  return shouldSkipOpenCodeTLSVerify() ? new https.Agent({ rejectUnauthorized: false }) : undefined;
-}
-
-/** 將逗號分隔的 API key 字串拆成陣列 */
-function splitKeys(value) {
-  if (!value) return [];
-  return value.split(',').map(k => k.trim()).filter(Boolean);
+  return new https.Agent({ rejectUnauthorized: false });
 }
 
 export function getLLMConfig() {
-  const checks = [
-    ['openai',   splitKeys(process.env.OPENAI_API_KEY),   process.env.OPENAI_BASE_URL || 'https://api.openai.com/v1',   process.env.OPENAI_MODEL || 'gpt-4o-mini'],
-    ['claude',   splitKeys(process.env.CLAUDE_API_KEY),   process.env.CLAUDE_BASE_URL || 'https://api.anthropic.com/v1', process.env.CLAUDE_MODEL || 'claude-3-haiku-20240307'],
-    ['gemini',   splitKeys(process.env.GEMINI_API_KEY),   process.env.GEMINI_BASE_URL || 'https://generativelanguage.googleapis.com/v1beta', process.env.GEMINI_MODEL || 'gemini-2.5-flash'],
-    ['ollama',   ['ollama'],                               process.env.OLLAMA_BASE_URL,  process.env.OLLAMA_MODEL],
-    ['amazonq',  splitKeys(process.env.AMAZONQ_API_KEY),  process.env.AMAZONQ_BASE_URL  || 'https://q.api.aws',              process.env.AMAZONQ_MODEL  || 'amazon-q'],
-    ['opencode', ['opencode'], process.env.OPENCODE_BASE_URL, process.env.OPENCODE_MODEL || 'gemini-2.5-flash'],
-  ];
-  for (const [provider, apiKeys, baseURL, model] of checks) {
-    if (apiKeys.length > 0 && baseURL) return { provider, apiKeys, baseURL, model };
+  if (process.env.OPENCODE_BASE_URL) {
+    return {
+      provider: 'opencode',
+      apiKeys: ['opencode'],
+      baseURL: process.env.OPENCODE_BASE_URL,
+      model: process.env.OPENCODE_MODEL || 'gemini-2.5-flash',
+    };
   }
   return { provider: null, apiKeys: [], baseURL: null, model: null };
 }