eorm, internal/valuer: 摒弃中间表达，直接依赖于 Scan

[codecov[bot]]

Codecov Report

Merging #79 (dbb3895) into main (55a49e2) will decrease coverage by 2.63%. The diff coverage is 78.94%.

@@            Coverage Diff             @@
##             main      #79      +/-   ##
==========================================
- Coverage   84.20%   81.56%   -2.64%     
==========================================
  Files          18       17       -1     
  Lines        1374     1123     -251     
==========================================
- Hits         1157      916     -241     
+ Misses        183      175       -8     
+ Partials       34       32       -2     

Impacted Files	Coverage Δ
db.go	76.66% <ø> (-7.16%)	:arrow_down:
internal/valuer/reflect.go	76.31% <72.72%> (-7.02%)	:arrow_down:
internal/valuer/unsafe.go	93.93% <85.71%> (-0.88%)	:arrow_down:
builder.go	80.85% <100.00%> (+3.92%)	:arrow_up:

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