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/i18n/locales/en-US.ts

@@ -292,7 +292,7 @@ const enUS = {
       dragAndDrop: 'Drag and drop files here or click to upload',
       uploading: 'Uploading...',
       supportedFormats:
-        'Supports PDF, Word, TXT, Markdown and other document formats',
+        'Supports PDF, Word, TXT, Markdown, HTML, ZIP and other document formats',
       uploadSuccess: 'File uploaded successfully!',
       uploadError: 'File upload failed, please try again',
       uploadingFile: 'Uploading file...',