Decouple core Yaak logic from Tauri (#354)

crates/yaak-models/migrations/20250108205117_workspace-meta.sql

@@ -0,0 +1,11 @@
+CREATE TABLE workspace_metas
+(
+    id               TEXT                               NOT NULL
+        PRIMARY KEY,
+    model            TEXT     DEFAULT 'workspace_meta'  NOT NULL,
+    workspace_id     TEXT                               NOT NULL
+        REFERENCES workspaces ON DELETE CASCADE,
+    created_at       DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    updated_at       DATETIME DEFAULT CURRENT_TIMESTAMP NOT NULL,
+    setting_sync_dir TEXT
+);