[7651] Data-farm > Applications 2 - store + first consumer

[n-lark]

Description

• Adds data-farm-applications Pinia store as the single source of truth for team applications.
• Team Applications list now reads from the store behind a skeleton loader; drops its local Map + spinner. ensure-guard skips refetch on app→app nav.
• Routes create, update, and delete through the store so mutations upsert/remove — fixes the same-session "created it → appears without reload" bug.

Live updates will be in a follow up PR under: Applications 3 - subscriber #7652

See test plan: #7651 (comment)

Related Issue(s)

Resolves #7651

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 76.14%. Comparing base (4d41fa5) to head (8469acb).

Additional details and impacted files

@@                   Coverage Diff                    @@
##           7650-df-applications-be    #8021   +/-   ##
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  Coverage                    76.14%   76.14%           
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  Files                          439      439           
  Lines                        23562    23562           
  Branches                      6276     6276           
========================================================
  Hits                         17942    17942           
  Misses                        5620     5620           

Flag	Coverage Δ
backend	76.14% <ø> (ø)

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