fix: resolve govet inline and modernize lint errors

[k1LoW]

make lint was failing on two issues:

• table.go:435 — govet inline flagged ptrInt64(0) because ptrInt64 in apply.go is annotated with //go:fix inline.
• action.go:657 — modernize slicesbackward flagged the manual reverse index loop in generateDeleteActions.

Changes:

• Inline the single ptrInt64(0) callsite in table.go to new(int64) and remove the now-unused helper from apply.go.
• Rewrite the backward loop in generateDeleteActions using slices.Backward.

Verified with make lint (0 issues) and go test ./... (all packages pass).

[github-actions]

Code Metrics Report

	main (38d7305)	#524 (96e8372)	+/-
Coverage	33.7%	33.7%	-0.1%
Code to Test Ratio	1:0.9	1:0.9	+0.0
Test Execution Time	11s	13s	+2s

Details

  |                     | main (38d7305) | #524 (96e8372) |  +/-  |
  |---------------------|----------------|----------------|-------|
- | Coverage            |          33.7% |          33.7% | -0.1% |
  |   Files             |             31 |             31 |     0 |
  |   Lines             |           3407 |           3405 |    -2 |
- |   Covered           |           1151 |           1150 |    -1 |
+ | Code to Test Ratio  |          1:0.9 |          1:0.9 |  +0.0 |
  |   Code              |           7022 |           7018 |    -4 |
  |   Test              |           6578 |           6578 |     0 |
- | Test Execution Time |            11s |            13s |   +2s |

Code coverage of files in pull request scope (28.1% → 28.0%)

Files	Coverage	+/-	Status
action.go	80.7%	-0.1%	modified
apply.go	1.4%	+0.0%	modified
table.go	4.2%	0.0%	modified

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Reported by octocov