refactor(fast-down-api): 重构fast-down-api

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[codecov]

Codecov Report

❌ Patch coverage is 82.17143% with 156 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...s/fast-down-api/src/core/download/plan/mismatch.rs	52.05%	35 Missing ⚠️
crates/fast-pull/src/core/single.rs	0.00%	28 Missing ⚠️
crates/fast-down-api/src/core/download/plan/mod.rs	86.14%	23 Missing ⚠️
...ates/fast-down-api/src/core/download/plan/fresh.rs	89.51%	15 Missing ⚠️
...tes/fast-down-api/src/core/download/plan/common.rs	84.21%	12 Missing ⚠️
crates/fast-down-api/src/core/state.rs	76.59%	11 Missing ⚠️
...s/fast-down-api/src/core/download/plan/manifest.rs	90.29%	10 Missing ⚠️
...tes/fast-down-api/src/core/download/plan/resume.rs	92.80%	9 Missing ⚠️
...rates/fast-down-api/src/core/download/overwrite.rs	56.25%	7 Missing ⚠️
crates/fast-down-api/src/core/download/pipeline.rs	69.23%	4 Missing ⚠️
... and 1 more

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