refactor(ci): decouple from upstream Parity infrastructure

Replace Parity-specific infrastructure dependencies with Pezkuwi's own:
- S3 release uploads → GitHub Releases (gh CLI)
- parity-zombienet runner labels → pezkuwi-runner
- Grafana/Loki log URLs → disabled (use GH artifacts)
- Matrix notifications → disabled (pending Pezkuwi Matrix)
- paritytech issue links → pezkuwi tracking issues
- paritytech Docker image refs → pezkuwi-sdk-frame in cmd.py
- Add mirror-ci-image.yml workflow for GHCR image mirroring
- Document upstream shared tools (resolc, try-runtime, evm-test-suite)

.github/workflows/release-reusable-rc-build.yml

@@ -205,6 +205,7 @@ jobs:
          run: brew install solidity
 
        - name: Install resolc
+         # NOTE: resolc is an upstream shared tool from paritytech/revive (EVM compiler)
          run: |
             VERSION="0.3.0"
             ASSET_URL="https://github.com/paritytech/revive/releases/download/v$VERSION/resolc-universal-apple-darwin"