refactor(startup): simplify stack to Tauri-managed OpenFang + optional ChromeDriver

- Remove OpenFang CLI dependency from startup scripts
- OpenFang now bundled with Tauri and managed via gateway_start/gateway_status commands
- Add bootstrap screen in App.tsx to auto-start local gateway before UI loads
- Update Makefile: replace start-no-gateway with start-desktop-only
- Fix gateway config endpoints: use /api/config instead of /api/config/quick
- Add Playwright dependencies for future E2E testing

Makefile

@@ -1,7 +1,7 @@
 # ZCLAW Makefile
 # Cross-platform task runner
 
-.PHONY: help start start-dev start-no-browser start-no-gateway desktop desktop-build setup test clean
+.PHONY: help start start-dev start-no-browser desktop desktop-build setup test clean
 
 help: ## Show this help message
 	@echo "ZCLAW - OpenFang Desktop Client"
@@ -13,16 +13,16 @@ help: ## Show this help message
 # === Startup Commands ===
 
 start: ## Start all services (Windows: PowerShell)
-	@pwsh -File ./start.ps1
+	@powershell -ExecutionPolicy Bypass -File ./start-all.ps1
 
 start-dev: ## Start all services in dev mode
-	@pwsh -File ./start.ps1 -Dev
+	@powershell -ExecutionPolicy Bypass -File ./start-all.ps1 -Dev
 
 start-no-browser: ## Start without ChromeDriver
-	@pwsh -File ./start.ps1 -NoBrowser
+	@powershell -ExecutionPolicy Bypass -File ./start-all.ps1 -NoBrowser
 
-start-no-gateway: ## Start without OpenFang gateway
-	@pwsh -File ./start.ps1 -NoGateway
+start-desktop-only: ## Start desktop only (no external services)
+	@powershell -ExecutionPolicy Bypass -File ./start-all.ps1 -DesktopOnly
 
 start-unix: ## Start all services (Unix: macOS/Linux)
 	@chmod +x ./start.sh && ./start.sh
@@ -54,12 +54,6 @@ typecheck: ## Run TypeScript type check
 
 # === Services ===
 
-gateway: ## Start OpenFang gateway
-	@openfang gateway start
-
-gateway-status: ## Check gateway status
-	@openfang gateway status
-
 chromedriver: ## Start ChromeDriver on port 4444
 	@chromedriver --port=4444