86 task need to deduplicate the blobs

[Aravinda-HWK]

📌 Description

The email attachments have been moved to the blob storage(SeaweedFS which is s3 compatible blob storage)

• Closes [TASK] Need to deduplicate the blobs #86

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🔍 Changes Made

• Create s3.go file to connect to Seaweedfs, upload file, download file, list files etc.
• Blob will be saved in the blob storage in parser.go file
• Reconstruct the email by downloading the attachment from the blob storage.
• Change all other dependent services.

✅ Checklist (Email System)

• Core IMAP commands tested (LOGIN, CAPABILITY, LIST, SELECT, FETCH, LOGOUT).
• Authentication is tested.
• Docker build & run validated.
• Configuration loading verified for default and custom paths.
• Persistent storage with Docker volume verified.
• Error handling and logging verified
• Documentation updated (README, config samples).

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🧪 Testing Instructions

To test the server, use the instructions in the README in the test directory.

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📷 Screenshots / Logs (if applicable)

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⚠️ Notes for Reviewers