refactor(browser): split browser cores via build ARG, add core selector (#237)

* refactor(browser): split browser cores via build ARG, add core selector

- Replace playwright official image with ubuntu:noble base in both
  docker/Dockerfile.browser and devenv/Dockerfile.browser; install
  browsers at build time driven by ARG/ENV BROWSER_CORES
- Add GET /cores endpoint to Browser Gateway reporting available cores
- Proxy GET /browser-contexts/cores in Go handler to Browser Gateway
- Add `core` field to BrowserContextConfigModel and GatewayBrowserContext;
  context creation selects the appropriate browser instance by core
- Frontend context-setting page fetches available cores and renders a
  core selector; saves core as part of the config JSON
- install.sh prompts for browser core selection and writes BROWSER_CORES
  to .env; builds the browser image locally before docker compose up
- Regenerate OpenAPI spec and TypeScript SDK

* fix: lint

scripts/install.sh

@@ -99,6 +99,7 @@ WORKSPACE="$WORKSPACE_DEFAULT"
 MEMOH_DATA_DIR="$MEMOH_DATA_DIR_DEFAULT"
 USE_CN_MIRROR="${USE_CN_MIRROR:-false}"
 USE_SPARSE="${USE_SPARSE:-false}"
+BROWSER_CORES="${BROWSER_CORES:-chromium,firefox}"
 
 if [ "$SILENT" = false ]; then
   echo "Configure Memoh (press Enter to use defaults):" > /dev/tty
@@ -148,6 +149,19 @@ if [ "$SILENT" = false ]; then
     y|Y|yes|YES) USE_SPARSE=true ;;
   esac
 
+  echo "" > /dev/tty
+  echo "  Browser core selection:" > /dev/tty
+  echo "    1) Chromium only (smaller image)" > /dev/tty
+  echo "    2) Firefox only" > /dev/tty
+  echo "    3) Both Chromium and Firefox (default)" > /dev/tty
+  printf "  Browser core [3]: " > /dev/tty
+  read -r input < /dev/tty || true
+  case "$input" in
+    1) BROWSER_CORES="chromium" ;;
+    2) BROWSER_CORES="firefox" ;;
+    *) BROWSER_CORES="chromium,firefox" ;;
+  esac
+
   echo "" > /dev/tty
 fi
 
@@ -222,11 +236,17 @@ fi
 echo POSTGRES_PASSWORD="${PG_PASS}" >> .env
 echo MEMOH_CONFIG=./config.toml >> .env
 echo MEMOH_DATA_DIR="{$MEMOH_DATA_DIR}" >> .env
+echo BROWSER_CORES="${BROWSER_CORES}" >> .env
 echo USE_SPARSE="${USE_SPARSE}" >> .env
+echo "${GREEN}✓ Browser cores: ${BROWSER_CORES}${NC}"
 
 echo ""
 echo "${GREEN}Pulling latest Docker images...${NC}"
-$DOCKER compose $COMPOSE_FILES $COMPOSE_PROFILES pull
+$DOCKER compose $COMPOSE_FILES $COMPOSE_PROFILES pull --ignore-buildable
+
+echo ""
+echo "${GREEN}Building browser image (cores: ${BROWSER_CORES})...${NC}"
+$DOCKER compose $COMPOSE_FILES $COMPOSE_PROFILES build browser
 
 echo ""
 echo "${GREEN}Starting services (first startup may take a few minutes)...${NC}"