feat: migrate to cloverlabs-camoufox, pin playwright<1.61, add tini as PID 1

- Migrate from daijro/camoufox==0.4.* to cloverlabs-camoufox==0.6.*
  (drop-in API: same import path, same kwargs)
- Pin playwright>=1.58,<1.61 to prevent protocol error
  (Browser.setDefaultViewport viewport.isMobile incompatibility with
  camoufox bundled Firefox v135.0.1-beta.24; upstream daijro/camoufox#653)
- Bump fastapi 0.136->0.139, pytest 9.0->9.1, pytest-asyncio 1.3->1.4
  (absorbs Renovate PRs #360, #359, #357)
- Remove dead deptry DEP002 pyautogui ignore (cloverlabs dropped pyautogui)
- Add tini to Dockerfile base image and set as ENTRYPOINT PID 1
  (fixes zombie/defunct Firefox subprocesses: [Socket Process],
  [RDD Process], [Utility Process] — verified: 21 zombies without tini,
  0 zombies with tini after 5 POST /v1 requests)
- Remove init: true from compose.yaml (tini makes it redundant)
- Remove --init/init: true checkbox from bug report template

Closes #339, #340, #360, #359, #357, #366

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -9,7 +9,6 @@ body:
       label: "I've completed the following steps:"
       options:
         - label: Read Loop Warning on Readme
-        - label: "Used --init/init: true in docker run/compose.yaml"
         - label: Done the troubleshooting from Readme
         - label: Checked if such issue already exists
         - label: Checked other websites with Cloudflare Turnstile