Sweep: Add a new backend service to this blog app that the user can view the blog by the "category" of the blog similar to the "tag" (✓ Sandbox Passed)

[helado12]

Description

This pull request adds a new backend service to the blog app that allows users to view blogs by category, similar to the existing functionality for viewing blogs by tag.

Summary

• Added getBlogsByCategoryId method to BlogDao.java
• Added CategoryDao.java with methods to list all categories and get category by ID
• Added Category entity with fields for category name and description
• Updated Blog entity to include a Category field
• Updated BlogService.java to include getBlogsByCategory method
• Updated BlogDao.xml to include SQL query for getting blogs by category
• Added CategoryDao.xml with SQL queries for listing all categories and getting category by ID

Fixes #3.

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[helado12]

Rollback Files For Sweep

• [ ] Rollback changes to src/main/resources/mapper/CategoryDao.xml
• [ ] Rollback changes to src/main/java/com/htr/dao/BlogDao.java
• [ ] Rollback changes to src/main/java/com/htr/dao/CategoryDao.java
• [ ] Rollback changes to src/main/resources/mapper/BlogDao.xml
• [ ] Rollback changes to src/main/java/com/htr/entity/Blog.java
• [ ] Rollback changes to src/main/java/com/htr/entity/Category.java
• [ ] Rollback changes to src/main/java/com/htr/service/BlogService.java

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