Add new parser commands and FDS reliability fix

- HW Number Read/Write (mwh?, mrh?)
- Serial Number Read/Write (mws?, mrs?)
- FW Version Read (mfv?)
- Piezo TX/RX Deactivate (mpb?)
- Fix config_save() to wait for previous FDS operation instead of skipping
- Disable legacy s-prefix commands (ssz, srz, siz, shz, ssv) in cmd_parse.c

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

project/ble_peripheral/ble_app_bladder_patch/fstorage.c

@@ -269,10 +269,19 @@ void config_save( void )
 
     DBG_PRINTF("[CFG_SAVE] start\r\n");
 
-    /* Skip if a previous FDS operation is still in progress (non-blocking) */
+    /* Wait for any previous FDS operation to complete */
     if (fds_flag_write) {
-        DBG_PRINTF("[CFG_SAVE] busy, skipped\r\n");
-        return;
+        uint32_t wait_cnt = 0;
+        DBG_PRINTF("[CFG_SAVE] waiting for prev FDS op...\r\n");
+        while (fds_flag_write && wait_cnt < 3000) {
+            nrf_pwr_mgmt_run();
+            nrf_delay_ms(1);
+            wait_cnt++;
+        }
+        if (fds_flag_write) {
+            DBG_PRINTF("[CFG_SAVE] TIMEOUT! forcing flag clear\r\n");
+            fds_flag_write = false;
+        }
     }
 
     if( m_config.magic_number != (uint32_t)CONFIG_MAGIC_NUMBER_VALUE )