[8081] Data Farm > Hosted Instances 3 - subscriber

[n-lark]

Description

See test plan: #8081 (comment)

1. Adds a hosted-instances subscriber so the team Instances list syncs across sessions in realtime create/delete/update without a reload.
2. Routes p/+/created|updated|deleted into the store; leaves p/+/state to live-status.
3. Paginated-aware: delete removes, create appends, update merges in place. Ordering settles on the next fetch.

Related Issue(s)

Resolves #8081

Checklist

• I have read the contribution guidelines
• Suitable unit/system level tests have been added and they pass
• Documentation has been updated
  • Upgrade instructions
  • Configuration details
  • Concepts
• Changes flowforge.yml?
  • Issue/PR raised on FlowFuse/helm to update ConfigMap Template
  • Issue/PR raised on FlowFuse/CloudProject to update values for Staging/Production
• Link to Changelog Entry PR, or note why one is not needed.

Labels

• Includes a DB migration? -> add the area:migration label

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.18%. Comparing base (5639d81) to head (b35f09a).

Additional details and impacted files

@@                   Coverage Diff                    @@
##           8080-df-instances-store    #8153   +/-   ##
========================================================
  Coverage                    76.18%   76.18%           
========================================================
  Files                          440      440           
  Lines                        23613    23616    +3     
  Branches                      6289     6290    +1     
========================================================
+ Hits                         17990    17993    +3     
  Misses                        5623     5623           

Flag	Coverage Δ
backend	76.18% <100.00%> (+<0.01%)	⬆️

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