test: add comprehensive e2e test suite with shared helpers and DB seeding

Extract shared test runner (helpers.js), add file-based SQLite with
setup_db.py for fixture seeding, and add tests for auth guard, credentials
management, full registration flow, health endpoint, password auth, and
magic link registration errors. 66 checks across 7 test files.

tests/e2e/run.sh

@@ -16,11 +16,16 @@ PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
 PORT="${E2E_PORT:-8099}"
 export TARGET_URL="http://127.0.0.1:${PORT}"
 
+# --- Temp directory for e2e state ---
+E2E_TMPDIR="$(mktemp -d)"
+export OIDC_OP_SQLITE_PATH="${E2E_TMPDIR}/e2e_test.db"
+export OIDC_OP_SIGNING_KEY_PATH="${E2E_TMPDIR}/keys"
+
 # --- Start the app ---
 echo "Starting Porchlight on port ${PORT}..."
+echo "  DB: ${OIDC_OP_SQLITE_PATH}"
 OIDC_OP_ISSUER="${TARGET_URL}" \
 OIDC_OP_DEBUG=true \
-OIDC_OP_SQLITE_PATH=:memory: \
   uv run --directory "$PROJECT_ROOT" \
   uvicorn fastapi_oidc_op.app:create_app \
     --factory --host 127.0.0.1 --port "$PORT" \
@@ -31,6 +36,7 @@ cleanup() {
   echo "Stopping server (pid ${SERVER_PID})..."
   kill "$SERVER_PID" 2>/dev/null || true
   wait "$SERVER_PID" 2>/dev/null || true
+  rm -rf "$E2E_TMPDIR"
 }
 trap cleanup EXIT
 
@@ -48,6 +54,12 @@ for i in $(seq 1 30); do
   sleep 1
 done
 
+# --- Seed test data ---
+echo "Seeding test data..."
+E2E_FIXTURES=$(uv run --directory "$PROJECT_ROOT" python tests/e2e/setup_db.py)
+export E2E_FIXTURES
+echo "Test fixtures: ${E2E_FIXTURES}"
+
 # --- Run tests ---
 FAILED=0