add: track shared modules, vendor scripts, and update gitignore

- lib/common.py: shared run/load_json/save_json utilities
- webui/api/common.py: _ok/_error response helpers
- webui/static/htmx.min.js, json-enc.js: vendored frontend deps
- scripts/update-vendor.sh: frontend vendor updater
- vendor/acme.sh: bundled ACME client
- .gitignore: add .playwright-mcp/ and opencode.json.pwenv

scripts/update-vendor.sh

@@ -0,0 +1,38 @@
+#!/usr/bin/env bash
+# Download and vendor frontend JS libraries into webui/static/
+# and backend binaries into vendor/.
+# Run from the project root after updating the VERSION variables below.
+set -euo pipefail
+
+# ---- Library versions ----
+HTMX_VERSION="2.0.4"
+HTMX_JSON_ENC_VERSION="2.0.0"
+ACME_VERSION="3.1.3"
+
+STATIC_DIR="webui/static"
+
+download() {
+    local name="$1" url="$2" dest="$3"
+    if [[ -n "${SKIP_DOWNLOAD:-}" ]]; then
+        echo "[skip] $name (SKIP_DOWNLOAD is set)"
+        return
+    fi
+    echo "[download] $name → $dest"
+    curl -sfL -o "$dest" "$url"
+}
+
+download "htmx@${HTMX_VERSION}" \
+    "https://unpkg.com/htmx.org@${HTMX_VERSION}/dist/htmx.min.js" \
+    "${STATIC_DIR}/htmx.min.js"
+
+download "htmx-ext-json-enc@${HTMX_JSON_ENC_VERSION}" \
+    "https://unpkg.com/htmx-ext-json-enc@${HTMX_JSON_ENC_VERSION}/json-enc.js" \
+    "${STATIC_DIR}/json-enc.js"
+
+download "acme.sh@${ACME_VERSION}" \
+    "https://raw.githubusercontent.com/acmesh-official/acme.sh/${ACME_VERSION}/acme.sh" \
+    "vendor/acme.sh"
+
+chmod +x "vendor/acme.sh"
+
+echo "[done] All libraries vendored."