feat: add ZIP file upload support for knowledge base (#1626)

* feat: add ZIP file upload support for knowledge base

- Add _parse_zip method to FileParser class using zipfile library
- Support extraction and processing of TXT, PDF, DOCX, MD, HTML files from ZIP
- Update FileUploadZone to accept .zip files
- Add ZIP format to supported formats in internationalization files
- Implement error handling for invalid ZIP files and unsupported content
- Follow existing async parsing patterns and error handling conventions

Co-Authored-By: Rock <rockchinq@gmail.com>

* refactor: modify ZIP processing to store each document as separate file

- Remove _parse_zip method from FileParser as ZIP handling now occurs at knowledge base level
- Add _store_zip_file method to RuntimeKnowledgeBase to extract and store each document separately
- Each document in ZIP is now stored as individual file entry in knowledge base
- Process ZIP files in memory using io.BytesIO to avoid filesystem writes
- Generate unique file names for extracted documents to prevent conflicts

Co-Authored-By: Rock <rockchinq@gmail.com>

* perf: delete temp files

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Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: Rock <rockchinq@gmail.com>

web/src/app/home/knowledge/components/kb-docs/FileUploadZone.tsx

@@ -104,7 +104,7 @@ export default function FileUploadZone({
             id="file-upload"
             className="hidden"
             onChange={handleFileSelect}
-            accept=".pdf,.doc,.docx,.txt,.md,.html"
+            accept=".pdf,.doc,.docx,.txt,.md,.html,.zip"
             disabled={isUploading}
           />