chore: update plan docs, submodule ref

.sisyphus/plans/device-status-heartbeat.md

@@ -87,7 +87,7 @@ Wave FINAL: Build verification + code review
 
 ## TODOs
 
-- [ ] 1. Start heartbeat collector in main.go
+- [x] 1. Start heartbeat collector in main.go
 
   **What to do**:
   - In `apps/server-core/main.go`, after line 176 (`hbMgr := heartbeat.NewHeartbeatManager(rdb, db)`), add:
@@ -112,7 +112,7 @@ Wave FINAL: Build verification + code review
   - [ ] `StartHeartbeatCollector` called conditionally (only if Redis configured)
   - [ ] `go build ./...` passes
 
-- [ ] 2. Add WgServerID json tag + WgServer relation to Device model
+- [x] 2. Add WgServerID json tag + WgServer relation to Device model
 
   **What to do**:
   - In `apps/server-core/internal/models/models.go`, modify the Device struct:
@@ -143,7 +143,7 @@ Wave FINAL: Build verification + code review
   - [ ] `wg_server` object appears in JSON response when preloaded
   - [ ] `go build ./...` passes
 
-- [ ] 3. Preload WgServer in Devices List handler
+- [x] 3. Preload WgServer in Devices List handler
 
   **What to do**:
   - In `apps/server-core/api/devices.go`, DeviceList handler (line 35-56):
@@ -160,7 +160,7 @@ Wave FINAL: Build verification + code review
   - [ ] GET /api/v1/devices returns `wg_server` object with `name`, `public_endpoint` etc.
   - [ ] `go build ./...` passes
 
-- [ ] 4. Update Device TS interface + add Server column in Devices.vue
+- [x] 4. Update Device TS interface + add Server column in Devices.vue
 
   **What to do**:
   - In `apps/dashboard-ui/src/api/devices.ts`:
@@ -206,8 +206,8 @@ Wave FINAL: Build verification + code review
 
 ## Final Verification Wave
 
-- [ ] F1. **Build Verification** — `go build ./...` passes for server-core
-- [ ] F2. **Review changes** — All 4 files modified correctly
+- [x] F1. **Build Verification** — `go build ./...` passes for server-core
+- [x] F2. **Review changes** — All 4 files modified correctly
 
 ---