Fix file uploads: include content in messages, update README, remove secrets

- File uploads now read content and include in AI context
- Truncate files over 50KB to avoid token limits
- Updated README with JSON config documentation
- Removed secrets.json from git tracking

client/main.js

@@ -550,15 +550,18 @@ async function handleFileSelect(e) {
   
   for (const file of files) {
     try {
-      const uploaded = await api.uploadFile(file);
+      // Read file content
+      const content = await readFileContent(file);
+      
       state.files.push({
-        id: uploaded.id,
+        id: file.name + '-' + Date.now(),
         name: file.name,
         type: file.type,
-        size: file.size
+        size: file.size,
+        content: content
       });
     } catch (err) {
-      console.error('Failed to upload file:', file.name, err);
+      console.error('Failed to read file:', file.name, err);
     }
   }
   
@@ -566,6 +569,15 @@ async function handleFileSelect(e) {
   e.target.value = '';
 }
 
+function readFileContent(file) {
+  return new Promise((resolve, reject) => {
+    const reader = new FileReader();
+    reader.onload = () => resolve(reader.result);
+    reader.onerror = reject;
+    reader.readAsText(file);
+  });
+}
+
 function renderFilesPreview() {
   const container = document.getElementById('files-preview');
   if (!container) return;
@@ -663,8 +675,16 @@ async function handleSendMessage() {
 function buildMessageContent(text, files) {
   if (!files.length) return text;
   
-  const fileDescriptions = files.map(f => `[Attached: ${f.name}]`).join('\n');
-  return `${text}\n\n${fileDescriptions}`;
+  const fileContents = files.map(f => {
+    const maxLen = 50000; // Limit file content length
+    const content = f.content || '[File content not available]';
+    const truncated = content.length > maxLen 
+      ? content.substring(0, maxLen) + '\n... [truncated]' 
+      : content;
+    return `--- ${f.name} ---\n${truncated}\n--- end of ${f.name} ---`;
+  }).join('\n\n');
+  
+  return `${text}\n\n${fileContents}`;
 }
 
 function updateLastMessage(content) {