Rebuild admin pages around DataTable/AdminModal; restructure categories/groups and v2 groups API

Remove the generic $lib/svelte-admin CRUD layer and AdminTable.svelte; each
admin route now owns its own form/modal logic. Add DataTable.svelte,
superform-errors.ts, and profile-specific modal/field components.

Flatten proclamation categories/groups and drop subscription levels; add the
v2 groups API; update v1/v2 endpoints, serializers, auth, and regenerated
Prisma client with the new migrations.

Document the overhaul plan in docs/ADMIN_OVERHAUL.md.

AGENTS.md

@@ -9,11 +9,11 @@ AGENTS.md
 at your project root:
 
 ````text
-# Rhemawave Portal AI Guide
+# Radiant Wave Portal AI Guide
 
 ## Mission
 
-You are working on portal.Rhemawavetech.com.
+You are working on portal.radiantwavetech.com.
 
 Act as a senior engineer making complete, production-ready changes.
 
@@ -97,9 +97,9 @@ Use narrower commands when appropriate.
 
 If validation fails:
 
-* Diagnose the failure.
-* Fix the issue.
-* Run validation again.
+- Diagnose the failure.
+- Fix the issue.
+- Run validation again.
 
 Never finish with known failures.
 
@@ -109,19 +109,19 @@ Never finish with known failures.
 
 Application:
 
-portal.Rhemawavetech.com
+portal.radiantwavetech.com
 
 Stack:
 
-* SvelteKit 2
-* Svelte 5
-* TypeScript
-* Tailwind CSS v4
-* Prisma 7
-* PostgreSQL
-* Better Auth
-* Vitest
-* Playwright
+- SvelteKit 2
+- Svelte 5
+- TypeScript
+- Tailwind CSS v4
+- Prisma 7
+- PostgreSQL
+- Better Auth
+- Vitest
+- Playwright
 
 Package manager:
 
@@ -266,9 +266,9 @@ AdminPage.svelte
 
 Registry metadata exists for:
 
-* columns
-* searches
-* relations
+- columns
+- searches
+- relations
 
 Forms are manually implemented per route.
 
@@ -309,8 +309,8 @@ Only load that file when modifying Svelte components or Svelte logic.
 
 Testing uses:
 
-* Vitest
-* Playwright browser testing
+- Vitest
+- Playwright browser testing
 
 For testing patterns, read:
 
@@ -338,10 +338,10 @@ Only load that file when working on API functionality.
 
 Prettier rules:
 
-* tabs
-* single quotes
-* no trailing commas
-* 80 character print width
+- tabs
+- single quotes
+- no trailing commas
+- 80 character print width
 
 Follow existing formatting.
 
@@ -391,17 +391,14 @@ Confirm:
 2. Relevant tests/checks were run.
 3. Failures were fixed.
 4. The final response explains:
-
-   * what changed
-   * files modified
-   * verification performed
+   - what changed
+   - files modified
+   - verification performed
 
 Do not stop at:
 
-* "I found the issue"
-* "Here is a plan"
-* "The next step would be"
+- "I found the issue"
+- "Here is a plan"
+- "The next step would be"
 
 Finish the work.
-
-