feat: expand companion platform, device controls, and memoir workflows

Add customer and operator login, BLE provisioning, device fleet controls, call memory, memoir generation, and refreshed family and maintenance portals. Include API contracts, migrations, firmware sources, tests, assets, and deployment documentation.

firmware/echoear-platform-agent/components/av_processor/include/audio_processor.h

@@ -251,6 +251,10 @@ esp_err_t audio_recorder_pause(void);
  *       - Other   Appropriate esp_err_t error code on failure
  */
 esp_err_t audio_recorder_resume(void);
+// Pause microphone reads and AFE wake detection without destroying audio tasks.
+esp_err_t audio_recorder_set_standby(bool standby);
+bool audio_recorder_is_standby(void);
+uint32_t audio_recorder_microphone_reads(void);
 
 /**
  * @brief  Get the AFE manager handle of the audio recorder
@@ -333,6 +337,8 @@ esp_err_t audio_feeder_stop(void);
  *       - Other   Appropriate esp_err_t error code on failure
  */
 esp_err_t audio_feeder_feed_data(uint8_t *data, int data_size);
+/* Bounded queue waits for clients with a local audio authorization deadline. */
+esp_err_t audio_feeder_feed_data_timeout(uint8_t *data, int data_size, uint32_t timeout_ms);
 
 /**
  * @brief  Open the audio playback module