[ADD] User: Show categorized search path suggestions while typing #12

When the user focuses on the main search input and starts typing, show categorized suggestions based on SitepathModel data (as shown in the images below).

• For example, typing GTU should surface:

  GTU
  GTU / results
  GTU / notification
  GTU / myresults
  

• After typing a space (e.g., GTU ), display the next-level paths (see Image 2).

Data source:

• Create two models to back this feature:

  1. SitepathCategoryModel

     • name (varchar)
     • alternative_name (varchar) — comma-separated aliases (e.g., "users, students")
     • path (varchar)
     • icon (image or URL)

  2. SitepathModel

     • name (varchar)
     • alternative_name (varchar) — comma-separated aliases (e.g., "home, dashboard")
     • path (varchar)
     • login_path (varchar)
     • icon (image or URL)
     • is_login (bool)
     • is_access (bool)
     • is_deleted (bool)
     • category (ForeignKey to SitepathCategoryModel)