feat: unify source and skills for Dever 0.1.2 installation

.trellis/tasks/10-05-install-entry/task.json

@@ -0,0 +1,26 @@
+{
+  "id": "install-entry",
+  "name": "install-entry",
+  "title": "Dever 单命令安装入口与官方源迁移",
+  "description": "实现自包含 Bash install，复用签名安装器并统一 git.dever.cc 下载源，完成隔离定向验证",
+  "status": "in_progress",
+  "dev_type": null,
+  "scope": null,
+  "package": null,
+  "priority": "P2",
+  "creator": "Antigravity",
+  "assignee": "Antigravity",
+  "createdAt": "2026-10-05",
+  "completedAt": null,
+  "branch": "feat/install-entry",
+  "base_branch": "main",
+  "worktree_path": null,
+  "commit": null,
+  "pr_url": null,
+  "subtasks": [],
+  "children": [],
+  "parent": null,
+  "relatedFiles": [],
+  "notes": "",
+  "meta": {}
+}