fix: allow tag rename without type payload

[lyzno1]

Summary

• split console tag create and update payload schemas so renaming a tag only requires name
• keep tag type sourced from the existing tag record during rename instead of requiring clients to resend it
• update the oRPC tag update contract to return the updated tag and use the server response for cache updates

Context

This fixes a regression introduced by #34422. That refactor made TagBasePayload.type required while PATCH /tags/{tag_id} still reused the create payload, causing rename requests with { name } to fail with type Field required.

Tests

• uv run --project api pytest api/tests/unit_tests/controllers/console/tag/test_tags.py -q
• pnpm -C web test service/client.spec.ts
• uv run --project api python -m py_compile api/controllers/console/tag/tags.py api/controllers/service_api/dataset/dataset.py api/services/tag_service.py

[github-actions]

Pyrefly Type Coverage

Metric	Base	PR	Delta
Type coverage	0.00%	43.71%	+43.71%
Strict coverage	0.00%	43.23%	+43.23%
Typed symbols	0	22,054	+22,054
Untyped symbols	0	28,718	+28,718
Modules	0	2552	+2,552

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 85.93%. Comparing base (5798610) to head (5d77b2b).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
api/controllers/service_api/dataset/dataset.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #36182      +/-   ##
==========================================
- Coverage   85.93%   85.93%   -0.01%     
==========================================
  Files        4454     4454              
  Lines      210842   210847       +5     
  Branches    39412    39414       +2     
==========================================
- Hits       181189   181188       -1     
- Misses      26453    26459       +6     
  Partials     3200     3200              

Flag	Coverage Δ
api	85.41% <85.71%> (+<0.01%)	⬆️
dify-ui	94.40% <ø> (ø)
web	86.60% <100.00%> (-0.01%)	⬇️

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