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/Cargo.toml

@@ -9,6 +9,7 @@ authors.workspace = true
 adapter-onlyoffice = { path = "../adapter-onlyoffice" }
 axum = { version = "0.8", features = ["multipart", "ws"] }
 bridge-runtime = { path = "../bridge-runtime" }
+control-plane = { path = "../control-plane" }
 core-protocol = { path = "../core-protocol" }
 futures-util = "0.3"
 hyper = "1"
@@ -30,3 +31,4 @@ base64 = "0.22"
 comrak = { version = "0.52", default-features = false }
 notify = "8.2.0"
 time = { version = "0.3", features = ["formatting", "local-offset"] }
+uuid = { version = "1", features = ["v4"] }