Add AnyClip integration tools and extracted source code

- Add authentication scripts with SubtleCrypto password encryption
- Add sourcemap extraction pipeline (update-urls, download-sourcemaps, extract-sources)
- Add Playwright API interception script for monetization endpoints
- Document two-step auth flow with JWT tokens and dual cookies
- Move extracted source from root to anyclip/ directory
- Add project configuration (.env.example, .gitignore, CLAUDE.md)

anyclip/client/request-idle-callback.ts

@@ -0,0 +1,23 @@
+export const requestIdleCallback =
+  (typeof self !== 'undefined' &&
+    self.requestIdleCallback &&
+    self.requestIdleCallback.bind(window)) ||
+  function (cb: IdleRequestCallback): number {
+    let start = Date.now()
+    return self.setTimeout(function () {
+      cb({
+        didTimeout: false,
+        timeRemaining: function () {
+          return Math.max(0, 50 - (Date.now() - start))
+        },
+      })
+    }, 1)
+  }
+
+export const cancelIdleCallback =
+  (typeof self !== 'undefined' &&
+    self.cancelIdleCallback &&
+    self.cancelIdleCallback.bind(window)) ||
+  function (id: number) {
+    return clearTimeout(id)
+  }