feat(storage): add datasets resource-type prefix to dataset logical paths

[aicam]

Summary

Introduces a datasets resource-type prefix to dataset logical file paths, changing the format from:

/ownerEmail/datasetName/versionName/fileRelativePath

to:

/datasets/ownerEmail/datasetName/versionName/fileRelativePath

This namespaces dataset paths under an explicit resource-type segment, leaving room for other resource types in the future.

Changes

Backend (Scala)

• FileResolver: strips a known RESOURCE_TYPE_PREFIXES = Set("datasets") leading segment before parsing; docs/examples updated.
• DatasetFileNode.fromLakeFSRepositoryCommittedObjects: builds an intermediate datasets directory node as the parent of owner nodes.
• DatasetResource: descends through the new datasets node to reach the owner node; total-size calculation rooted at the datasets node.
• FileResolverSpec: test fixtures updated to the prefixed path format.

Frontend (TypeScript)

• dataset-file.ts: parseFilePathToDatasetFile strips the datasets prefix if present; parseDatasetFileToFilePath emits it.
• datasetVersionFileTree.ts: relative-path extraction now strips four leading segments (datasets/owner/dataset/version) instead of three.

Notes

• Net diff is small (6 files, +45/-21). The branch was synced with the latest apache/main (via the aicam fork's main) before opening this PR.

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[github-actions]

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[github-actions]

Automated Reviewer Suggestions

Based on the git blame history of the changed files, we recommend the following reviewers:

• Contributors with relevant context: @Yicong-Huang, @aglinxinyuan, @Ma77Ball
  You can notify them by mentioning @Yicong-Huang, @aglinxinyuan, @Ma77Ball in a comment.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 30.00000% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.06%. Comparing base (8803d08) to head (e38a355).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...ache/texera/service/resource/DatasetResource.scala	0.00%	3 Missing ⚠️
...tend/src/app/common/type/datasetVersionFileTree.ts	0.00%	3 Missing ⚠️
...pache/texera/amber/core/storage/FileResolver.scala	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5911      +/-   ##
============================================
- Coverage     54.11%   54.06%   -0.05%     
+ Complexity     2819     2811       -8     
============================================
  Files          1103     1103              
  Lines         42650    42654       +4     
  Branches       4588     4589       +1     
============================================
- Hits          23079    23061      -18     
- Misses        18226    18245      +19     
- Partials       1345     1348       +3     

Flag	Coverage Δ		*Carryforward flag
access-control-service	70.44% <ø> (ø)
agent-service	34.36% <ø> (ø)		Carriedforward from 8803d08
amber	55.55% <75.00%> (-0.09%)	⬇️
computing-unit-managing-service	1.65% <ø> (ø)
config-service	57.35% <ø> (ø)
file-service	58.45% <0.00%> (-0.15%)	⬇️
frontend	48.09% <0.00%> (-0.03%)	⬇️
pyamber	90.20% <ø> (ø)		Carriedforward from 8803d08
python	90.76% <ø> (ø)		Carriedforward from 8803d08
workflow-compiling-service	58.69% <ø> (ø)

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