Optimize ContentUploader to only upload new or changed articles

[Copilot]

The ContentUploader was previously uploading all articles on every run, regardless of whether the content had changed. This resulted in unnecessary Azure Table Storage operations and inefficient processing.

Changes Made

1. Added Change Detection Infrastructure

• Added ContentHash field to ContentEntity to store SHA256 hash of article content
• Implemented CalculateContentHash() method that creates a hash from all content fields (title, category, tags, difficulty, author, description, content)
• Added GetExistingContent() method to safely retrieve existing content from Azure Table Storage

2. Enhanced Upload Logic

Modified UploadToTableStorage() to:

• Check if content already exists in storage
• Compare content hashes to detect changes
• Only upload if content is new or has been modified
• Provide clear logging about actions taken:
  • "Skipping {filename} - no changes detected"
  • "Uploaded new content: {filename}"
  • "Updated changed content: {filename}"

3. Improved Console Output

• Removed redundant success messages from Program.cs
• Centralized all upload status logging in the upload helper

Example Behavior

Before:

Successfully uploaded tip1.md to Azure Table Storage.
Successfully uploaded tip2.md to Azure Table Storage.
Successfully uploaded tip3.md to Azure Table Storage.

Every file uploaded regardless of changes.

After:

Uploaded new content: tip1.md
Skipping tip2.md - no changes detected
Updated changed content: tip3.md

Only new or changed content is uploaded.

Testing

• ✅ Verified identical content produces same hash
• ✅ Verified different content produces different hash
• ✅ Confirmed existing content detection works correctly
• ✅ Validated logging provides clear feedback

This optimization significantly reduces Azure Storage operations and improves processing efficiency when running bulk content uploads.

Fixes #3.

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