SHAKTI Slider Database Stream Fix — Newtrend Host
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This revision fixes slider images that existed in the sliders database but did
not render on index.php because the browser was asked to access the upload path
directly.

New flow:
  index.php -> slider-media.php?id=<database id> -> sliders table -> image_path
            -> uploads/sliders/<file> -> streamed image response

Files changed/added:
  index.php
  slider-media.php (new)
  includes/content.php
  admin/sliders.php
  assets/css/style.css

Important:
- Database remains the single source of truth for slider rows.
- No old/static slider fallback is used.
- Mobile image is optional; slider-media.php uses the same row's desktop image
  when type=mobile is requested and no mobile file exists.
- Admin preview also uses slider-media.php, so public/admin use one media path.
- The admin page shows whether uploads/sliders is writable.

If an existing database row points to a file that was physically deleted,
re-upload that slider image from Admin > Home Slider.