fix(heartbeat): Tauri invoke 参数名修正 snake_case → camelCase

Tauri 2.x 默认将 Rust snake_case 参数重命名为 camelCase，
前端 invoke 必须使用 camelCase (agentId 而非 agent_id)。

修复 3 处 invoke 调用：
- heartbeat_update_memory_stats (agentId, taskCount, totalEntries, storageSizeBytes)
- heartbeat_record_correction (agentId, correctionType)
- heartbeat_record_interaction (agentId)

desktop/src/lib/intelligence-client.ts

@@ -1190,10 +1190,10 @@ export const intelligenceClient = {
       if (isTauriRuntime()) {
         await tauriInvoke('heartbeat.updateMemoryStats', () =>
           invoke('heartbeat_update_memory_stats', {
-            agent_id: agentId,
-            task_count: taskCount,
-            total_entries: totalEntries,
-            storage_size_bytes: storageSizeBytes,
+            agentId: agentId,
+            taskCount: taskCount,
+            totalEntries: totalEntries,
+            storageSizeBytes: storageSizeBytes,
           })
         );
       } else {
@@ -1212,8 +1212,8 @@ export const intelligenceClient = {
       if (isTauriRuntime()) {
         await tauriInvoke('heartbeat.recordCorrection', () =>
           invoke('heartbeat_record_correction', {
-            agent_id: agentId,
-            correction_type: correctionType,
+            agentId: agentId,
+            correctionType: correctionType,
           })
         );
       } else {
@@ -1230,7 +1230,7 @@ export const intelligenceClient = {
       if (isTauriRuntime()) {
         await tauriInvoke('heartbeat.recordInteraction', () =>
           invoke('heartbeat_record_interaction', {
-            agent_id: agentId,
+            agentId: agentId,
           })
         );
       } else {