feat(voice): add on-device Miao Zhang Gui wake word

Add an optional local wake response prompt configuration. The prompt asset is intentionally not included yet.

main/Kconfig.projbuild

@@ -879,6 +879,99 @@ menu "Example Configuration"
             help
                 Leave disabled for the default active-low Button 2 wiring.
 
+        config TQ_LOCAL_WAKE_ENABLE
+            bool "Enable local wake-word listener"
+            default y
+            help
+                Use the on-device Chinese MultiNet model to detect 喵掌柜.
+                The physical PTT button remains enabled as a parallel entry.
+
+        config TQ_LOCAL_WAKE_RESPONSE_PROMPT_ENABLE
+            bool "Enable local wake response prompt"
+            depends on TQ_LOCAL_WAKE_ENABLE
+            default n
+            help
+                Play a short acknowledgement after 喵掌柜 is detected and
+                before the normal single-turn dialog starts. Keep disabled
+                until the placeholder Opus asset has been supplied.
+
+        config TQ_LOCAL_WAKE_RESPONSE_PROMPT_FILE
+            string "Local wake response prompt file"
+            depends on TQ_LOCAL_WAKE_ENABLE
+            default "/littlefs/audio_prompts/local_wake_response.opus"
+            help
+                Reserved LittleFS path for the future wake acknowledgement.
+                Add local_wake_response.opus under
+                components/platform/assets/audio_prompts before enabling it.
+
+        config TQ_LOCAL_WAKE_RETRY_MS
+            int "Local wake startup retry delay (ms)"
+            depends on TQ_LOCAL_WAKE_ENABLE
+            default 5000
+            range 500 60000
+
+        config TQ_LOCAL_WAKE_STOP_WAIT_MS
+            int "Local wake lifecycle wait (ms)"
+            depends on TQ_LOCAL_WAKE_ENABLE
+            default 1000
+            range 100 5000
+
+        config TQ_LOCAL_WAKE_TASK_STACK_BYTES
+            int "Local wake control task stack (bytes)"
+            depends on TQ_LOCAL_WAKE_ENABLE
+            default 6144
+            range 4096 32768
+
+        config TQ_LOCAL_WAKE_TASK_PRIORITY
+            int "Local wake control task priority"
+            depends on TQ_LOCAL_WAKE_ENABLE
+            default 4
+            range 1 10
+
+        config TQ_LOCAL_WAKE_TASK_CORE
+            int "Local wake control task core (-1 for no affinity)"
+            depends on TQ_LOCAL_WAKE_ENABLE
+            default 0
+            range -1 1
+
+        config TQ_LOCAL_COMMAND_TASK_STACK_BYTES
+            int "MultiNet inference task stack (bytes)"
+            depends on TQ_LOCAL_WAKE_ENABLE
+            default 8192
+            range 6144 32768
+
+        config TQ_LOCAL_COMMAND_TASK_PRIORITY
+            int "MultiNet inference task priority"
+            depends on TQ_LOCAL_WAKE_ENABLE
+            default 7
+            range 1 10
+
+        config TQ_LOCAL_COMMAND_TASK_CORE
+            int "MultiNet inference task core (-1 for no affinity)"
+            depends on TQ_LOCAL_WAKE_ENABLE
+            default 0
+            range -1 1
+
+        config TQ_LOCAL_COMMAND_CONTROL_TIMEOUT_MS
+            int "MultiNet control acknowledgement timeout (ms)"
+            depends on TQ_LOCAL_WAKE_ENABLE
+            default 1000
+            range 100 5000
+
+        config TQ_LOCAL_COMMAND_DETECTION_TIMEOUT_MS
+            int "MultiNet utterance detection timeout (ms)"
+            depends on TQ_LOCAL_WAKE_ENABLE
+            default 6000
+            range 1000 15000
+
+        config TQ_LOCAL_COMMAND_DETECTION_THRESHOLD_X10000
+            int "MultiNet detection threshold (x10000)"
+            depends on TQ_LOCAL_WAKE_ENABLE
+            default 1200
+            range 1 9999
+            help
+                Initial threshold is 0.12 and must be tuned with device audio.
+
         config MULTIMODAL_HEARTBEAT_INTERVAL_MS
             int "Heartbeat interval (ms)"
             default 50000
@@ -966,10 +1059,11 @@ menu "Example Configuration"
 
             config MULTIMODAL_AUDIO_CODEC_CHANNELS
                 int "Codec channels"
-                default 1
-                range 1 1
+                default 2
+                range 2 2
                 help
-                    Fixed at 1 for the raw-opus 16kHz mono voice contract.
+                    Two physical ES8311 slots are captured: microphone and DAC
+                    playback reference. The external Opus contract remains mono.
 
             config MULTIMODAL_AUDIO_CODEC_BITS_PER_SAMPLE
                 int "Codec bits per sample"
@@ -1051,6 +1145,22 @@ menu "Example Configuration"
                     speech. Use 0 for the default left/first channel, or 1 if
                     level logs show speech energy on raw_ch1 instead of raw_ch0.
 
+            config MULTIMODAL_AUDIO_AEC_REFERENCE_CHANNEL
+                int "AEC playback reference channel"
+                default 1
+                range 0 1
+                help
+                    Interleaved ES8311 slot carrying the DAC playback reference.
+                    It must differ from the microphone channel.
+
+            config MULTIMODAL_AUDIO_AEC_FILTER_LENGTH
+                int "AEC filter length"
+                default 4
+                range 1 8
+                help
+                    ESP-SR synchronous AEC filter length. Four is the recommended
+                    starting point for ESP32-S3.
+
             config MULTIMODAL_AUDIO_LOG_UPLINK_LEVELS
                 bool "Log microphone uplink audio levels"
                 default n