feat: minify SDK JavaScript and improve build process

- Implemented minification of the cs-ai-agent-sdk.min.js file using Terser during the build process.
- Updated build-sdk.mjs to read the source code, minify it, and write the output to the target directory.
- Added logging to display the size reduction after minification.
- Removed redundant code and streamlined the configuration handling in the SDK.

web/scripts/build-sdk.mjs

@@ -1,6 +1,7 @@
-import { cp, mkdir } from "node:fs/promises";
+import { mkdir, readFile, writeFile } from "node:fs/promises";
 import path from "node:path";
 import { fileURLToPath } from "node:url";
+import { minify } from "terser";
 
 const currentDir = path.dirname(fileURLToPath(import.meta.url));
 const rootDir = path.resolve(currentDir, "..");
@@ -9,6 +10,27 @@ const targetDir = path.join(rootDir, "public", "sdk");
 const target = path.join(targetDir, "cs-ai-agent-sdk.min.js");
 
 await mkdir(targetDir, { recursive: true });
-await cp(source, target);
+const sourceCode = await readFile(source, "utf8");
+const result = await minify(sourceCode, {
+  compress: {
+    passes: 2,
+  },
+  mangle: true,
+  format: {
+    ascii_only: true,
+    comments: false,
+  },
+});
+
+if (!result.code) {
+  throw new Error("sdk minify failed: empty output");
+}
+
+await writeFile(target, `${result.code}\n`, "utf8");
+
+const sourceSize = Buffer.byteLength(sourceCode, "utf8");
+const targetSize = Buffer.byteLength(result.code, "utf8");
+const reduction = ((1 - targetSize / sourceSize) * 100).toFixed(1);
 
 console.log(`sdk written to ${target}`);
+console.log(`sdk minified ${sourceSize} -> ${targetSize} bytes (${reduction}% smaller)`);