feat: web UI + QR login + portable build

- Add web UI panel (dark theme) at / with REST API
- Add Bilibili QR code scan login with browser header emulation
- Add wanakana for English -> katakana conversion
- Add volume control (0%-200%)
- Add message format with '说、' pause marker
- PyInstaller --onedir build for portable exe
- Rate-limit danmaku logging (1/20)
- Fix aiohttp.access log spam
- Add README.md

package.json

@@ -0,0 +1,7 @@
+{
+  "name": "bililive-touhou-tts",
+  "type": "module",
+  "dependencies": {
+    "wanakana": "^5.3.1"
+  }
+}