多文件上传累积模式，前端文件列表支持删除，后端接收前端指定的文件列表

web/main.py

@@ -356,6 +356,7 @@ def run_analysis_task(session_id: str, files: list, user_requirement: str, is_fo
 class StartRequest(BaseModel):
     requirement: str
     template: Optional[str] = None
+    files: Optional[List[str]] = None
 
 class ChatRequest(BaseModel):
     session_id: str
@@ -383,10 +384,15 @@ async def upload_files(files: list[UploadFile] = File(...)):
 async def start_analysis(request: StartRequest, background_tasks: BackgroundTasks):
     session_id = session_manager.create_session()
     
-    # Use only the most recently uploaded files, not everything in uploads/
+    # Priority: request.files (from frontend) > last_uploaded > scan uploads/
-    files = getattr(app.state, 'last_uploaded_files', None)
+    files = None
+    if request.files:
+        files = [f for f in request.files if os.path.exists(f)]
+    if not files:
+        files = getattr(app.state, 'last_uploaded_files', None)
+        if files:
+            files = [f for f in files if os.path.exists(f)]
     if not files:
-        # Fallback: scan uploads directory
         files = glob.glob("uploads/*.csv") + glob.glob("uploads/*.xlsx")
     if not files:
         raise HTTPException(status_code=400, detail="No data files found. Please upload files first.")

web/static/clean_style.css

@@ -409,6 +409,18 @@ body {
     border-radius: 0.25rem;
 }
 
+.file-remove {
+    margin-left: auto;
+    cursor: pointer;
+    color: #9CA3AF;
+    font-size: 1.1rem;
+    line-height: 1;
+    padding: 0 0.25rem;
+}
+.file-remove:hover {
+    color: #EF4444;
+}
+
 /* Tabs */
 .tabs {
     display: flex;

web/static/script.js

@@ -64,29 +64,49 @@ if (fileInput) {
     fileInput.addEventListener('click', (e) => e.stopPropagation());
 }
 
+// Track all uploaded file paths for this session
+let uploadedFilePaths = [];
+
 async function handleFiles(files) {
     if (files.length === 0) return;
 
-    fileList.innerHTML = '';
     const formData = new FormData();
-
     for (const file of files) {
         formData.append('files', file);
-        const fileItem = document.createElement('div');
-        fileItem.className = 'file-item';
-        fileItem.innerHTML = `<i class="fa-regular fa-file-excel"></i> ${file.name}`;
-        fileList.appendChild(fileItem);
     }
 
     try {
         const res = await fetch('/api/upload', { method: 'POST', body: formData });
-        if (!res.ok) alert('Upload failed');
+        if (!res.ok) { alert('Upload failed'); return; }
+        const data = await res.json();
+        // Accumulate uploaded paths
+        if (data.paths) {
+            uploadedFilePaths = uploadedFilePaths.concat(data.paths);
+        }
+        renderFileList();
     } catch (e) {
         console.error(e);
         alert('Upload failed');
     }
 }
 
+function renderFileList() {
+    fileList.innerHTML = '';
+    for (let i = 0; i < uploadedFilePaths.length; i++) {
+        const fname = uploadedFilePaths[i].split('/').pop().split('\\').pop();
+        const fileItem = document.createElement('div');
+        fileItem.className = 'file-item';
+        fileItem.innerHTML = `<i class="fa-regular fa-file-excel"></i> ${fname}
+            <span class="file-remove" onclick="removeUploadedFile(${i})" title="移除">&times;</span>`;
+        fileList.appendChild(fileItem);
+    }
+}
+
+window.removeUploadedFile = function(index) {
+    uploadedFilePaths.splice(index, 1);
+    renderFileList();
+}
+
 // --- Template Logic ---
 async function loadTemplates() {
     try {
@@ -142,6 +162,9 @@ async function startAnalysis() {
         if (selectedTemplate) {
             body.template = selectedTemplate;
         }
+        if (uploadedFilePaths.length > 0) {
+            body.files = uploadedFilePaths;
+        }
 
         const res = await fetch('/api/start', {
             method: 'POST',