feat(cli): implement modular command architecture with build config

- Refactor CLI entry point to use modular command structure
- Add list command with placeholder implementation
- Set up type definitions for command interface
- Configure TypeScript build and package files for distribution
- Add dist output to .gitignore

src/lib/config.ts

@@ -0,0 +1,30 @@
+import type { BrickConfig } from "../types/index.js";
+
+const DEFAULT_SOURCE =
+  "https://gitea.synoth.com/synoth/brick-index/raw/branch/master/blocks.yaml";
+
+function parseSourceFromArgs(args: string[]): string | undefined {
+  const idx = args.indexOf("--source");
+  if (idx !== -1 && idx + 1 < args.length) {
+    return args[idx + 1];
+  }
+  return undefined;
+}
+
+function isRemoteSource(source: string): boolean {
+  return source.startsWith("http://") || source.startsWith("https://");
+}
+
+export function resolveConfig(args: string[]): BrickConfig {
+  const cliSource = parseSourceFromArgs(args);
+  if (cliSource) {
+    return { source: cliSource, isRemote: isRemoteSource(cliSource) };
+  }
+
+  const envSource = process.env.BRICK_SOURCE;
+  if (envSource) {
+    return { source: envSource, isRemote: isRemoteSource(envSource) };
+  }
+
+  return { source: DEFAULT_SOURCE, isRemote: true };
+}