feat(fracmanager): add handling for upload queue overflow and disk space exhaustion

[eguguchkin]

Fixes #265

---

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• I used LLM/AI assistance to make this pull request;

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Please refer to CONTRIBUTING.md

[github-actions]

❌ PR Title Validation Failed
Please refer to CONTRIBUTING.md

[github-actions]

🔴 Performance Degradation

Some benchmarks have degraded compared to the previous run.
Click on Show table button to see full list of degraded benchmarks.

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Name	Previous	Current	Ratio	Verdict
FindSequence_Random/large-4	467eb3	081ef0
	12982.01 MB/s	11380.53 MB/s	0.88	🔴
	1262.00 ns/op	1440.00 ns/op	1.14	🔴
FindSequence_Random/small-4	467eb3	081ef0
	5128.78 MB/s	4548.61 MB/s	0.89	🔴
	49.91 ns/op	56.28 ns/op	1.13	🔴

[codecov-commenter]

Codecov Report

❌ Patch coverage is 41.40625% with 75 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.36%. Comparing base (378c06d) to head (266d02d).
⚠️ Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
fracmanager/lifecycle_manager.go	32.60%	30 Missing and 1 partial ⚠️
fracmanager/fraction_registry.go	27.50%	27 Missing and 2 partials ⚠️
fracmanager/tasks.go	73.07%	7 Missing ⚠️
cmd/seq-db/seq-db.go	0.00%	5 Missing ⚠️
fracmanager/proxy_frac.go	72.72%	2 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #266      +/-   ##
==========================================
- Coverage   71.61%   71.36%   -0.26%     
==========================================
  Files         204      205       +1     
  Lines       14737    14852     +115     
==========================================
+ Hits        10554    10599      +45     
- Misses       3430     3499      +69     
- Partials      753      754       +1     

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