feat: add AI catalog description generation

backend/src/config.ts

@@ -31,6 +31,7 @@ export interface AppConfig {
   ollamaEnsureTimeoutMs: number;
   piManagementTimeoutMs: number;
   secretsFile?: string;
+  installationConfigFile?: string;
   piAuthFile?: string;
   secretFiles: Readonly<Record<string, string | undefined>>;
   modelApiKeyFile?: string;
@@ -322,6 +323,13 @@ export function loadConfig(
     secretsFile.trim() !== secretsFile || secretsFile.length === 0 || secretsFile.includes("\0")
     || !path.isAbsolute(secretsFile)
   )) throw new Error("secret bundle configuration is invalid");
+  const installationConfigFile = env.THT_INSTALLATION_CONFIG_FILE;
+  if (installationConfigFile !== undefined && (
+    installationConfigFile.trim() !== installationConfigFile
+    || installationConfigFile.length === 0
+    || installationConfigFile.includes("\0")
+    || !path.isAbsolute(installationConfigFile)
+  )) throw new Error("installation configuration is invalid");
   const piAuthFile = env.THT_PI_AUTH_FILE;
   if (piAuthFile !== undefined && (
     piAuthFile.trim() !== piAuthFile || piAuthFile.length === 0 || piAuthFile.includes("\0")
@@ -404,6 +412,7 @@ export function loadConfig(
     ollamaEnsureTimeoutMs: Number(env.OLLAMA_ENSURE_TIMEOUT_MS ?? 60000),
     piManagementTimeoutMs: piManagementTimeout(env.PI_MANAGEMENT_TIMEOUT_MS),
     secretsFile,
+    installationConfigFile,
     piAuthFile,
     secretFiles,
     modelApiKeyFile,