Add mcp-manager app: MCP server control panel w/ HTTPS SSE bridge

Single-container FastAPI + React UI plus mongo:7. Image bundles Node 20 + uv/uvx
so npx/uvx MCP servers run; package caches persisted under app-data. 127.0.0.1
/api healthcheck; admin email/password form fields + auto-generated JWT secret.

apps/mcp-manager/build/build.sh

@@ -0,0 +1,37 @@
+#!/bin/bash
+# Build and push the MCP Manager Docker image.
+# Clones the source repo (or reuses an existing checkout) and tags/pushes
+# both :latest and the version tag.
+
+set -euo pipefail
+
+IMAGE_NAME="${IMAGE_NAME:-git.alexzaw.dev/alexz/mcp-manager}"
+IMAGE_TAG="${IMAGE_TAG:-1.0.0}"
+SOURCE_REPO="${SOURCE_REPO:-https://git.alexzaw.dev/alexz/mcp-manager.git}"
+WORKDIR="${WORKDIR:-/tmp/mcp-manager-build}"
+
+echo "==> Preparing source at ${WORKDIR}"
+if [[ -d "${WORKDIR}/.git" ]]; then
+    git -C "${WORKDIR}" fetch --quiet origin
+    git -C "${WORKDIR}" reset --hard --quiet origin/HEAD
+else
+    rm -rf "${WORKDIR}"
+    git clone --quiet "${SOURCE_REPO}" "${WORKDIR}"
+fi
+
+echo "==> Building ${IMAGE_NAME}:${IMAGE_TAG} (and :latest)"
+cd "${WORKDIR}"
+docker build "$@" \
+    -t "${IMAGE_NAME}:${IMAGE_TAG}" \
+    -t "${IMAGE_NAME}:latest" \
+    .
+
+echo "==> Pushing ${IMAGE_NAME}:${IMAGE_TAG}"
+docker push "${IMAGE_NAME}:${IMAGE_TAG}"
+echo "==> Pushing ${IMAGE_NAME}:latest"
+docker push "${IMAGE_NAME}:latest"
+
+echo ""
+echo "Done. To install on Runtipi:"
+echo "  sudo /etc/runtipi/runtipi-cli appstore update"
+echo "  sudo /etc/runtipi/runtipi-cli app install mcp-manager:runtipi"