Remove file upload functionality and related components

The `FileUploadStore` and all file upload features were removed, simplifying the chat interface. This change eliminates unused code, including file handling logic, attachment management, and UI elements, streamlining the application.

workers/site/sdk/assistant-sdk.ts

@@ -6,13 +6,11 @@ export class AssistantSdk {
     maxTokens?: number;
     userTimezone?: string;
     userLocation?: string;
-    tools?: string[];
   }): string {
     const {
       maxTokens,
       userTimezone = "UTC",
       userLocation = "",
-      tools = [],
     } = params;
     const selectedFewshots = Sdk.selectEquitably?.(few_shots) || few_shots;
     const sdkDate =
@@ -23,17 +21,6 @@ export class AssistantSdk {
     const now = new Date();
     const formattedMinutes = String(now.getMinutes()).padStart(2, "0");
     const currentTime = `${now.getHours()}:${formattedMinutes} ${now.getSeconds()}s`;
-    // const toolsInfo =
-    //   tools
-    //     .map((tool) => {
-    //       switch (tool) {
-    //         // case "user-attachments": return "### Attachments\nUser supplied attachments are normalized to text and will have this header (# Attachment:...) in the message.";
-    //         // case "web-search": return "### Web Search\nResults are optionally available in 'Live Search'.";
-    //         default:
-    //           return `- ${tool}`;
-    //       }
-    //     })
-    //     .join("\n\n") || "- No additional tools selected.";
 
     return `# Assistant Knowledge
 ## Current Context