feat(app-server): persist remote-control desired state (#27445)

## Why

Remote-control runtime enablement and persisted enrollment preference
were represented by separate flags. That made startup rehydration, RPC
persistence, and new-enrollment seeding race with one another, and it
did not cleanly distinguish runtime-only CLI or daemon starts from
durable app-server RPC changes.

## What Changed

- Replace the parallel enablement, seed, and rehydration flags with one
transport-owned `RemoteControlDesiredState`.
- Add nullable enrollment-scoped persistence and preserve existing
preferences during enrollment upserts.
- Rehydrate plain startup only after auth and client scope resolve,
without overwriting a concurrent RPC transition.
- Make ordinary `remoteControl/enable` and `remoteControl/disable`
durable while retaining `ephemeral: true` for runtime-only callers.
- Have the daemon explicitly request ephemeral enablement and regenerate
the app-server schemas.

## Verification

- Covered migration and `NULL`/`0`/`1` persistence round trips.
- Covered plain-start rehydration and runtime-only versus durable
enrollment seeding.
- Covered durable enable, durable disable, and ephemeral enable through
app-server RPC.
- Covered the daemon's exact `{ "ephemeral": true }` request payload.

Related issue: N/A (internal remote-control persistence architecture
change).

codex-rs/app-server-protocol/schema/json/codex_app_server_protocol.schemas.json

@@ -14050,6 +14050,22 @@
         ],
         "type": "string"
       },
+      "RemoteControlDisableParams": {
+        "properties": {
+          "ephemeral": {
+            "type": "boolean"
+          }
+        },
+        "type": "object"
+      },
+      "RemoteControlEnableParams": {
+        "properties": {
+          "ephemeral": {
+            "type": "boolean"
+          }
+        },
+        "type": "object"
+      },
       "RemoteControlStatusChangedNotification": {
         "$schema": "http://json-schema.org/draft-07/schema#",
         "description": "Current remote-control connection status and remote identity exposed to clients.",