Enable first QQ group in CommunityModal - make "幻灵的炼丹工坊一群" clickable

This PR enables the previously disabled first QQ group "幻灵的炼丹工坊一群" in the CommunityModal component, making it functional and interactive for users. ## Changes Made The first group was previously disabled with the following issues: - Had `disabled` class preventing interaction - Status dot showed `offline` state - Had a disabled overlay blocking clicks - Button text said "点击加入" instead of the active "立即加入" - No click handler to open the QQ group link This PR fixes all these issues by: 1. **Enabling interaction**: Changed `class="group-item disabled"` to `class="group-item active"` 2. **Adding click handler**: Added `@click="goto('...')"` with placeholder QQ group URL 3. **Updating status**: Changed status dot from `offline` to `online` (green indicator) 4. **Removing overlay**: Deleted the `<div class="disabled-overlay"></div>` that was blocking interaction 5. **Updating button text**: Changed "点击加入" to "立即加入" to match the working second group ## Result The first group now behaves identically to the working second group: - ✅ Users can click to join the group - ✅ Shows green online status indicator - ✅ Has hover effects and proper styling - ✅ Uses consistent "立即加入" button text - ✅ Opens QQ group link in new tab when clicked **Note**: The QQ group link currently uses placeholder values (`PLACEHOLDER_KEY_FOR_GROUP_1` and `PLACEHOLDER_AUTH_KEY`) that should be replaced with the actual group credentials when available. ## File Changed - `components/main_page/CommunityModal.vue` (4 insertions, 4 deletions) > [!WARNING] > > <details> > <summary>Firewall rules blocked me from connecting to one or more addresses</summary> > > #### I tried to connect to the following addresses, but was blocked by firewall rules: > > - `mirrors.cloud.tencent.com` > - Triggering command: `node /usr/local/bin/yarn install` (dns block) > - Triggering command: `npm install` (dns block) > - `registry.npmmirror.com` > - Triggering command: `node /usr/local/bin/yarn install` (dns block) > - Triggering command: `npm install` (dns block) > > If you need me to access, download, or install something from one of these locations, you can either: > > - Configure [Actions setup steps](https://gh.io/copilot/actions-setup-steps) to set up my environment, which run before the firewall is enabled > - Add the appropriate URLs or hosts to the custom allowlist in this repository's [Copilot coding agent settings](https://github.com/HuanLinOTO/svc-fusion-docs/settings/copilot/coding_agent) (admins only) > > </details> <!-- START COPILOT CODING AGENT TIPS --> --- ✨ Let Copilot coding agent [set things up for you](https://github.com/HuanLinOTO/svc-fusion-docs/issues/new?title=✨Set+up+Copilot+instructions&body=Configure%20instructions%20for%20this%20repository%20as%20documented%20in%20%5BBest%20practices%20for%20Copilot%20coding%20agent%20in%20your%20repository%5D%28https://gh.io/copilot-coding-agent-tips%29%0A%0A%3COnboard%20this%20repo%3E&assignees=copilot) — coding agent works faster and does higher quality work when set up for your repo.