lint: complete fieldalignment cleanup and re-enable the linter [go part] #100

Split from LeanerCloud/cloud-commitments-cli#1373 (cross-component issue, monorepo split)

PR #1364 (lint-debt-clear) globally disables the fieldalignment linter in .golangci.yml as deferred debt after partially applying struct-reorder fixes. Per the no-masking directive this deferral must be tracked and closed: re-apply fieldalignment across the repo (struct field reordering for memory layout), restore/preserve all field documentation comments while reordering (a prior pass deleted several, including concurrency-invariant comments), remove any leftover _rvc autofix artifact names, and re-enable the linter in .golangci.yml. One mechanical PR.

Origin: pre-merge review of #1364, flagged against the 2026-06-30 no-masking-CI-debt directive; owner accepted deferral with tracked follow-up.

Scope for this repo

cloud-commitments-go's own .golangci.yml carries the identical disable, with the identical comment:

      enable-all: true
      disable:
        # fieldalignment: many production structs have alignment violations that
        # pre-date this PR; fixing them is a separate concern. Suppress globally
        # rather than per-struct since golangci-lint v2.10.x (CI) doesn't treat
        # severity:warning as a non-fatal exit, unlike v2.11+.
        - fieldalignment

This applies to this repo's own Go code: pkg/, providers/aws, providers/azure, providers/gcp, tests/e2e, plus the root module. Re-run fieldalignment (via go vet -vettool=$(which fieldalignment) or golangci-lint run --enable-only fieldalignment ./... per module) across all of them.

Acceptance criteria

• Struct field reordering applied across every module in this repo's go.work (., pkg, providers/aws, providers/azure, providers/gcp, tests/e2e) to satisfy fieldalignment.
• All pre-existing field documentation comments preserved across the reordering, including any concurrency-invariant comments.
• No leftover _rvc autofix artifact names remain.
• fieldalignment removed from the disable: list in .golangci.yml and the linter re-enabled.
• golangci-lint run passes clean with fieldalignment enabled across all modules.