Rename /version endpoint to /firmware_info; add heap memory statistics to firmware data and UI.

Software/MainBoard/rust/src/main.rs

@@ -1327,12 +1327,17 @@ async fn get_version(
     let hash = &env!("VERGEN_GIT_SHA")[0..8];
 
     let board = board.board_hal.get_esp();
+    let heap = esp_alloc::HEAP.stats();
     VersionInfo {
         git_hash: branch + "@" + hash,
         build_time: env!("VERGEN_BUILD_TIMESTAMP").to_owned(),
         current: format!("{:?}", board.current),
         slot0_state: format!("{:?}", board.slot0_state),
         slot1_state: format!("{:?}", board.slot1_state),
+        heap_total: heap.size,
+        heap_used: heap.current_usage,
+        heap_free: heap.size.saturating_sub(heap.current_usage),
+        heap_max_used: heap.max_usage,
     }
 }
 
@@ -1343,4 +1348,8 @@ struct VersionInfo {
     current: String,
     slot0_state: String,
     slot1_state: String,
+    heap_total: usize,
+    heap_used: usize,
+    heap_free: usize,
+    heap_max_used: usize,
 }