chore: update .gitignore, remove Dockerfile, and enhance documentation

- Added .release-version, CHANGELOG.md, and deploy/docker/docker-bake.override.hcl to .gitignore.
- Removed Dockerfile as part of the cleanup.
- Updated AGENTS.md and README.md to include new documentation on CI/Docker processes and deployment instructions.
- Enhanced package.json with new devDependencies for commit linting and semantic release.
- Updated pnpm-lock.yaml to reflect new dependencies and versions.

These changes streamline the project structure and improve documentation clarity.

scripts/ci/pnpm-ci.sh

@@ -0,0 +1,21 @@
+#!/usr/bin/env sh
+# pnpm install из кэша Gitea (store + node_modules). Без повторного download при hit.
+set -eu
+: "${PNPM_STORE_DIR:?PNPM_STORE_DIR required — run scripts/ci/export-cache-env.sh first}"
+
+export COREPACK_HOME="${COREPACK_HOME:-${HOME:-/root}/.cache/node/corepack}"
+mkdir -p "$PNPM_STORE_DIR" "$COREPACK_HOME"
+corepack enable
+pnpm config set store-dir "$PNPM_STORE_DIR"
+
+echo "pnpm store: $(pnpm store path)"
+echo "PNPM_CACHE_HIT=${PNPM_CACHE_HIT:-}"
+
+if [ "${PNPM_CACHE_HIT:-}" = "true" ]; then
+  if pnpm install --frozen-lockfile --offline; then
+    echo "pnpm install --offline (cache hit)"
+    exit 0
+  fi
+  echo "offline install failed — prefer-offline"
+fi
+pnpm install --frozen-lockfile --prefer-offline