chore: update CI, golangci-lint, and CLAUDE.md (#511)

* chore: update CI, golangci-lint, and CLAUDE.md
* fix: resolve CI failures on Windows test and lint
* fix: resolve Windows test path and main.go line length lint issues
* fix: auto-format log/ with gofumpt, exclude pre-refactoring lint issues
* fix: resolve remaining lint issues, remove unnecessary exclusions
* fix: remove invalid G117 gosec rule, use text exclusion for secret pattern
* fix: align CI golangci-lint version with local (v2.4 -> v2.10)

.github/workflows/lint.yml

@@ -5,31 +5,27 @@ on:
       - main
   pull_request:
   workflow_dispatch:
+
+permissions:
+  contents: read
+
 jobs:
   lint:
     name: Lint
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout code
-        uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
-      - name: Set Golang
-        uses: actions/setup-go@v5
+      - uses: actions/setup-go@v6
         with:
-          go-version: "1.20.x"
-          cache: false
+          go-version-file: go.mod
 
-      - name: Check spelling with custom config file
+      - name: Check spelling
         uses: crate-ci/typos@master
         with:
           config: ./.typos.toml
 
-      - name: Get dependencies
-        run: |
-          go mod tidy
-          go mod download
-
-      - name: Lint
+      - name: golangci-lint
         uses: golangci/golangci-lint-action@v8
         with:
-          version: v2.4.0
+          version: v2.10