feat(web): add product website with i18n and privacy policy

Static HTML product site for MeeYao with violet brand theme.
Supports EN/简中/繁體 via client-side i18n with localStorage persistence.
Includes index.html (landing page) and privacy.html (App Store compliance).
Hosted on meeyao.com, deployed to ~/deploy/web on EC2.

.trellis/tasks/04-30-product-website/task.json

@@ -0,0 +1,44 @@
+{
+  "id": "04-30-product-website",
+  "name": "04-30-product-website",
+  "title": "Product Website & Privacy Policy for App Store",
+  "description": "",
+  "status": "planning",
+  "dev_type": null,
+  "scope": null,
+  "priority": "P2",
+  "creator": "zl-q",
+  "assignee": "zl-q",
+  "createdAt": "2026-04-30",
+  "completedAt": null,
+  "branch": null,
+  "base_branch": "dev",
+  "worktree_path": null,
+  "current_phase": 0,
+  "next_action": [
+    {
+      "phase": 1,
+      "action": "implement"
+    },
+    {
+      "phase": 2,
+      "action": "check"
+    },
+    {
+      "phase": 3,
+      "action": "finish"
+    },
+    {
+      "phase": 4,
+      "action": "create-pr"
+    }
+  ],
+  "commit": null,
+  "pr_url": null,
+  "subtasks": [],
+  "children": [],
+  "parent": null,
+  "relatedFiles": [],
+  "notes": "",
+  "meta": {}
+}