fix: improve cache key quality across actions

Address cache key quality issues identified during code review.

php-composer:
- Remove unused cache-directories input and handling code
- Simplify cache paths to vendor + ~/.composer/cache only
- Eliminate empty path issue when cache-directories was default empty

npm-publish:
- Remove redundant -npm- segment from cache key
- Change: runner.os-npm-publish-{manager}-npm-{hash}
- To: runner.os-npm-publish-{manager}-{hash}

go-lint:
- Add ~/.cache/go-build to cached paths
- Now caches both golangci-lint and Go build artifacts
- Improves Go build performance

Result: Cleaner cache keys and better caching coverage

go-lint/action.yml

@@ -220,7 +220,9 @@ runs:
       if: inputs.cache == 'true'
       uses: actions/cache@0057852bfaa89a56745cba8c7296529d2fc39830 # v4.3.0
       with:
-        path: ~/.cache/golangci-lint
+        path: |
+          ~/.cache/golangci-lint
+          ~/.cache/go-build
         key: ${{ runner.os }}-golangci-${{ inputs.golangci-lint-version }}-${{ hashFiles('go.sum', inputs.config-file) }}
         restore-keys: |
           ${{ runner.os }}-golangci-${{ inputs.golangci-lint-version }}-