Add config migration mechanism

packages/main/src/backend/configManager/configManager.ts

@@ -2,6 +2,7 @@ import { configFilePath } from '@/app-globals';
 import { type Config } from '@/backend/commonTypes';
 import { decrypt, encrypt } from '@/backend/configManager/encryption/crypto';
 import { existsSync, promises as fs } from 'fs';
+import { migrateConfig } from './configMigration/configMigrator';
 import configExample from './defaultConfig';
 import logger from '/@/logging/logger';
 
@@ -19,7 +20,7 @@ export async function getConfig(configPath: string = configFilePath): Promise<Co
         logger.log('Empty config file found, returning default config');
         return configExample;
       }
-      return config;
+      return migrateConfig(config);
     } catch (e) {
       logger.error('Failed to parse config file, returning default config', e);
     }

packages/main/src/backend/configManager/configMigration/configMigrator.ts

@@ -0,0 +1,31 @@
+import { z } from 'zod';
+import { type Config } from '../../commonTypes';
+import { isOriginalConfig } from './versions/original';
+import { v1ConfigSchema } from './versions/v1';
+
+const latestConfigSchema = v1ConfigSchema;
+
+// migrations[n] should be a function that converts version n to version n+1
+// eslint-disable-next-line @typescript-eslint/no-explicit-any
+const migrations: Record<number, (config: any) => any> = {};
+
+export function migrateConfig(config: unknown): Config {
+  let currentConfig = config;
+  // original config does not have version key and must be handled separately
+  if (isOriginalConfig(config)) {
+    return config as Config;
+  }
+  let currentVersion = getConfigVersion(currentConfig);
+
+  while (migrations[currentVersion]) {
+    currentConfig = migrations[currentVersion](currentConfig);
+    currentVersion = getConfigVersion(currentConfig);
+  }
+
+  return latestConfigSchema.parse(currentConfig) as Config;
+}
+
+function getConfigVersion(config: unknown): keyof typeof migrations {
+  const versionSchema = z.object({ version: z.number().int().positive() });
+  return versionSchema.parse(config).version;
+}