refactor(printer): remove controller legacy and unify printer naming

README.md

@@ -1,12 +1,12 @@
-# ESP32-S3 TQ Printer Controller (Direct Thermal, No Business HTTP Server)
+# ESP32-S3 TQ Thermal Printer Firmware (No Business HTTP Server)
 
-This firmware now runs in direct-printer mode and does not expose the previous
+This firmware now runs in printer mode and does not expose the previous
 business REST endpoints (`/v1/*`).
 
 ## Features
 
-- Direct thermal printer backend (`PRINTER_BACKEND_DIRECT`)
-- Auto-connect direct printer during startup
+- Thermal printer driver (single printer path)
+- Auto-connect printer during startup
 - Async print queue and worker lifecycle management
 - Printer precheck (paper / battery / temperature)
 - MIC key push-to-talk voice flow (button-triggered, no HTTP trigger)
@@ -44,14 +44,14 @@ idf.py -p /dev/tty.usbmodemXXXX flash monitor
 
 ## Config
 
-In `menuconfig -> TQ Controller Config`:
+In `menuconfig -> TQ Printer Config`:
 
 - Wi-Fi provisioning:
   - `TQ_WIFI_PROV_SOFTAP_SSID`
   - `TQ_WIFI_PROV_SOFTAP_PASSWORD`
   - `TQ_WIFI_PROV_SOFTAP_CHANNEL`
   - `TQ_WIFI_PROV_SOFTAP_MAX_CONN`
-- Direct thermal printer runtime and safety policy:
+- Thermal printer runtime and safety policy:
   - `TQ_DIRECT_PRINTER_*`
   - `TQ_PRINTER_*`
 - Z-Image HTTP fields: