fix(controller): add validation for eval import/export

[goldenxinxing]

Description

1. add validation for import and export
2. tune request body

Modules

• UI
• Controller
• Agent
• Client
• Python-SDK
• Others

Checklist

• run code format and lint check
• add unit test
• add necessary doc

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (cdae936) 91.40% compared to head (a70a019) 82.82%.
Report is 7 commits behind head on main.

Files	Patch %	Lines
...ava/ai/starwhale/mlops/api/FineTuneController.java	0.00%	2 Missing ⚠️
.../starwhale/mlops/domain/ft/FineTuneAppService.java	92.85%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #3018      +/-   ##
============================================
- Coverage     91.40%   82.82%   -8.58%     
- Complexity        0     3158    +3158     
============================================
  Files           129      555     +426     
  Lines         15032    30421   +15389     
  Branches         61     1777    +1716     
============================================
+ Hits          13740    25197   +11457     
- Misses         1290     4414    +3124     
- Partials          2      810     +808     

Flag	Coverage Δ
console	?
controller	73.92% <86.66%> (?)
standalone	91.91% <100.00%> (+0.23%)	⬆️
unittests	91.91% <100.00%> (+0.51%)	⬆️

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[jialeicui]

LGTM