feat: refactor billing plans section and remove unused components

- Updated BillingPlansSection.vue to clean up unused code and improve readability.
- Removed CardPopover.vue and VideoGrid.vue components as they were no longer needed.
- Enhanced VideoTable.vue by integrating BaseTable for better table management and added loading states.
- Introduced secure JSON transformer for enhanced data security in RPC routes.
- Added key resolver for managing server key pairs.
- Created a script to generate NaCl keys for secure communications.
- Implemented admin page header management for better UI consistency.

scripts/gen-nacl-keys.ts

@@ -0,0 +1,7 @@
+// scripts/gen-nacl-keys.ts
+import nacl from "tweetnacl";
+
+const kp = nacl.box.keyPair();
+
+console.log("PUBLIC_KEY_BASE64=", Buffer.from(kp.publicKey).toString("base64"));
+console.log("SECRET_KEY_BASE64=", Buffer.from(kp.secretKey).toString("base64"));