chore: align sqlite control plane architecture

- replace default Convex control-plane wording with Rust SQLite control-plane across architecture, AGENTS, Reasonix, and design docs

- retire root Convex functions source and deploy script into recycle while keeping explicit cloud/compat/sync-replica boundaries

- add control-plane migration guard/docs and keep CodeGraph refreshed after the SQLite control-plane cutover

rust/crates/mnote-web/src/routes/web_shell.rs

@@ -7,6 +7,7 @@ use crate::routes::documents::{
     load_document_content_result, load_document_meta_result, DocumentContentQuery,
     DocumentMetaQuery,
 };
+use crate::routes::gateway::default_workspace_name_for_context;
 use crate::routes::local_folder_source::{
     ensure_local_workspace_read_access, is_local_access_policy_admin_context,
     load_local_folder_file_tree_snapshot, load_local_folder_page_tree_snapshot,
@@ -125,7 +126,7 @@ pub async fn document_page_shell(
         } else {
             None
         };
-    let default_workspace_name = format!("{} 的空间", state.config().dev_user_name);
+    let default_workspace_name = default_workspace_name_for_context(&state, &context);
     let mut workspace_projection = load_workspace_shell_projection(
         state.config(),
         &context,