feat(courses): add type, search, and pricing filters to org landing page

- Add Types section to the Filter sidebar with all 4 course types
- Add full-text search input centered in the hero (title + description)
- Add Pricing section (Free / Paid) based on course cost
- Compact hero prop across all 10 themes to halve vertical padding
- Children snippet support in all hero themes for the search input
- All filters are URL-driven (?types=, ?search=, ?tags=, ?pricing=)
- Full-stack: validation schema, DB queries, service, API route, server load, UI

apps/dashboard/src/lib/utils/translations/hi.json

@@ -3741,7 +3741,13 @@
     "filters": {
       "title": "टैग द्वारा फ़िल्टर करें",
       "help": "पाठ्यक्रमों को फ़िल्टर करने के लिए एक या अधिक टैग चुनें",
-      "empty": "अभी तक कोई टैग उपलब्ध नहीं है"
+      "empty": "अभी तक कोई टैग उपलब्ध नहीं है",
+      "tags_title": "टैग",
+      "types_title": "प्रकार",
+      "search_placeholder": "पाठ्यक्रम खोजें...",
+      "pricing_title": "मूल्य निर्धारण",
+      "pricing_free": "निःशुल्क",
+      "pricing_paid": "भुगतान किया गया"
     }
   },
   "tags_admin": {