fix: improve release scripts with .env loading and idempotent publish

Scripts now auto-load .env for GITEA_TOKEN, handle re-publishing
by deleting existing versions first, and release.sh does build +
publish + install in one command.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

scripts/build-rpm.sh

@@ -5,13 +5,17 @@ SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
 PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
 cd "$PROJECT_ROOT"
 
-export VERSION="${VERSION:-0.1.0}"
+# Load .env if present
+if [ -f .env ]; then
+  set -a; source .env; set +a
+fi
 
 echo "==> Building TypeScript..."
 pnpm build
 
 echo "==> Bundling standalone binary..."
 mkdir -p dist
+rm -f dist/mcpctl dist/mcpctl-*.rpm
 bun build src/cli/src/index.ts --compile --outfile dist/mcpctl
 
 echo "==> Packaging RPM..."