Update: 将子项目从 submodule 转为完整内容

- 移除 GovAI, nomifun-tauri, 算力盒子 的 submodule 引用
- 添加所有子项目的完整源代码
- 保留原始 .git 为 .git.bak 备份

nomifun-tauri/crates/backend/nomifun-db/migrations/016_companion_access_token.sql

@@ -0,0 +1,14 @@
+-- Per-companion access tokens for the Remote capability front door.
+-- Replaces the singleton `instance_api_token` (015): every external connection
+-- binds to exactly one companion. Only the SHA-256 hash is stored; the plaintext
+-- is shown once at mint time and never persisted.
+CREATE TABLE IF NOT EXISTS companion_access_token (
+    companion_id TEXT PRIMARY KEY,
+    token_hash   TEXT NOT NULL,
+    created_at   INTEGER NOT NULL
+);
+
+-- Retire the singleton instance token. Safe whether or not 015 was ever applied
+-- on this DB (fresh branch DB: 015 creates it, 016 drops it; already-migrated DB:
+-- 016 drops the existing table). No dead table remains.
+DROP TABLE IF EXISTS instance_api_token;