Fix CI build/deploy/smoke pipeline for the self-hosted qa runner (#3)

## Summary
- Fix a chain of QA CI issues: Docker build/health-check flakiness, NuGet vuln pins, then adds the post-deploy integration + Playwright smoke suite and works through everything needed to make it actually run on the self-hosted `qa` runner (musl/Alpine job container, no node/dotnet/curl preinstalled, docker-outside-of-docker networking).
- Adds a fixed dev/QA seed admin user + fixed Development environment API key so integration tests and e2e specs have a stable target.
- Pins Aspire's `AppHost.cs` ports/credentials to match the docker-compose local dev defaults.
- Adds `tests/api/MicCheck.Api.Tests.Integration` coverage for disabled flags, environment-document bootstrap, identity override precedence, auth login, and unauthorized access; adds a Playwright e2e suite under `src/admin/e2e` (login, nav, context selection, features CRUD/toggle).
- Adds a `smoke-qa` CI job that runs both suites against the just-deployed QA stack, working around: no curl/node/dotnet on the bare runner, musl vs glibc (Playwright browsers run via the official `mcr.microsoft.com/playwright` image instead), and the runner's job-container network isolation (reach the QA stack via the docker bridge gateway IP; `docker cp` instead of a bind mount to get files into the playwright container, since paths don't cross the docker-outside-of-docker boundary).

## Test plan
- [x] Unit tests pass (dotnet test tests/api/MicCheck.Api.Tests.Unit, 243 passed)
- [x] API integration suite passes against the real QA stack in CI
- [x] Playwright e2e suite passes against the real QA stack in CI (verified 3/3 locally against a real dev API + vite server for the flakiest spec)
- [x] Full CI pipeline (build → deploy-qa → smoke-qa) green end to end on the qa runner

Reviewed-on: #3

scripts/ci/lib.sh

@@ -37,6 +37,104 @@ image_names() {
   ADMIN_IMAGE="$REGISTRY/$REGISTRY_OWNER/miccheck-admin"
 }
 
+# Installs .NET into $CI_ROOT/.dotnet via the vendored dotnet-install.sh if
+# `dotnet` isn't already on PATH, then prepends it to PATH for this process.
+# Keeps bare runners (no SDK preinstalled) working the same as a dev machine.
+ensure_dotnet() {
+  if command -v dotnet > /dev/null 2>&1; then
+    return 0
+  fi
+
+  local install_dir="$CI_ROOT/.dotnet"
+  if [[ ! -x "$install_dir/dotnet" ]]; then
+    log "dotnet not found on PATH; installing .NET SDK via dotnet-install.sh"
+    bash "$CI_ROOT/dotnet-install.sh" --channel LTS --install-dir "$install_dir"
+  fi
+  export PATH="$install_dir:$PATH"
+  export DOTNET_ROOT="$install_dir"
+
+  ensure_dotnet_native_deps
+}
+
+# The .NET runtime is a native ELF binary that dynamically links libstdc++/libgcc.
+# Bare/minimal images (e.g. the act hostexecutor container) may lack them entirely,
+# which fails as an obscure symbol-relocation error rather than "command not found".
+ensure_dotnet_native_deps() {
+  if ldconfig -p 2>/dev/null | grep -q 'libstdc++\.so\.6'; then
+    return 0
+  fi
+
+  log "libstdc++.so.6 missing; installing native runtime deps for dotnet"
+  local sudo_cmd=""
+  if [[ "$(id -u)" -ne 0 ]] && command -v sudo > /dev/null 2>&1; then
+    sudo_cmd="sudo"
+  fi
+
+  if command -v apt-get > /dev/null 2>&1; then
+    $sudo_cmd apt-get update -y
+    $sudo_cmd apt-get install -y --no-install-recommends libstdc++6 libgcc-s1 libicu-dev ca-certificates
+  elif command -v apk > /dev/null 2>&1; then
+    # Alpine/musl runner - dotnet-install.sh falls back to the linux-musl-x64 SDK
+    # here, which still wants a real libstdc++/libgcc (not just gcompat).
+    $sudo_cmd apk add --no-cache libstdc++ libgcc icu-libs ca-certificates
+  else
+    fail "libstdc++.so.6 missing and neither apt-get nor apk is available; install a C++ runtime manually on this runner"
+  fi
+}
+
+# Installs Node.js into $CI_ROOT/.node from the official prebuilt tarball if
+# `npm` isn't already on PATH, then prepends it to PATH for this process.
+# Mirrors ensure_dotnet() above - keeps bare runners (no Node preinstalled,
+# e.g. the self-hosted qa runner) working the same as a dev machine.
+ensure_node() {
+  if command -v npm > /dev/null 2>&1; then
+    return 0
+  fi
+
+  # nodejs.org only ships glibc binaries; on a musl/Alpine runner (same one
+  # dotnet-install.sh detects and picks the linux-musl-x64 SDK for) that
+  # tarball fails to exec at all ("env: can't execute 'node'"). Prefer the
+  # distro's own package on musl instead of a broken glibc download.
+  if [[ ! -x "$CI_ROOT/.node/bin/node" ]] && command -v apk > /dev/null 2>&1; then
+    log "node not found on PATH; installing via apk (musl runner)"
+    local sudo_cmd=""
+    if [[ "$(id -u)" -ne 0 ]] && command -v sudo > /dev/null 2>&1; then
+      sudo_cmd="sudo"
+    fi
+    $sudo_cmd apk add --no-cache nodejs npm
+    return 0
+  fi
+
+  local node_version="22.14.0"
+  local install_dir="$CI_ROOT/.node"
+  if [[ ! -x "$install_dir/bin/node" ]]; then
+    log "node not found on PATH; installing Node.js v$node_version"
+    local tarball="node-v${node_version}-linux-x64"
+    local url="https://nodejs.org/dist/v${node_version}/${tarball}.tar.xz"
+    if command -v curl > /dev/null 2>&1; then
+      curl -fsSL "$url" -o "/tmp/${tarball}.tar.xz"
+    elif command -v wget > /dev/null 2>&1; then
+      wget -q "$url" -O "/tmp/${tarball}.tar.xz"
+    else
+      fail "neither curl nor wget found on PATH; cannot download Node.js"
+    fi
+    mkdir -p "$install_dir"
+    tar -xJf "/tmp/${tarball}.tar.xz" -C "$install_dir" --strip-components=1
+    rm -f "/tmp/${tarball}.tar.xz"
+  fi
+  export PATH="$install_dir/bin:$PATH"
+}
+
+# The IP address on which a container published on 0.0.0.0/<gateway-ip> is
+# reachable from a sibling container on docker's default bridge network (i.e.
+# the docker host's bridge-side address, not its public interface). Used to
+# bind QA's db port narrowly - reachable by the smoke-qa job container, not
+# exposed off-box the way 0.0.0.0 would be.
+docker_bridge_gateway() {
+  docker network inspect bridge -f '{{(index .IPAM.Config 0).Gateway}}' 2>/dev/null \
+    || ip route show default 2>/dev/null | awk '/default/ {print $3; exit}'
+}
+
 registry_login() {
   require_registry_vars
   [[ -n "$REGISTRY_USER" ]] || fail "REGISTRY_USER env var is required to push images"