修复人脸识别问题,更换facerknn，修复崩溃

src/ai_scheduler.cpp

@@ -401,6 +401,17 @@ AiScheduler::BorrowedInferResult AiScheduler::InferBorrowed(ModelHandle handle,
         return result;
     }
 
+    // DEBUG: 检查输出大小是否超出预分配 buffer
+    for (uint32_t i = 0; i < ctx->n_output; ++i) {
+        size_t prealloc_sz = ctx->output_buffers[i].size();
+        size_t actual_sz = outputs[i].size;
+        std::cerr << "[AiScheduler] output[" << i << "] prealloc=" << prealloc_sz
+                  << " actual=" << actual_sz << " type=" << ctx->output_attrs[i].type << "\n";
+        if (actual_sz > prealloc_sz && prealloc_sz > 0) {
+            std::cerr << "[AiScheduler] ERROR: output size exceeds preallocated buffer!\n";
+        }
+    }
+
     result.outputs.resize(ctx->n_output);
     for (uint32_t i = 0; i < ctx->n_output; ++i) {
         auto& out = result.outputs[i];