security(api): harden V3 authentication and unify CRUD endpoint patterns

Implemented critical security and architectural fixes to align the frontend with the Aether API V3 standard and resolve 403 Forbidden race conditions.

- Unified CRUD Helpers: Updated get, create, update, and delete helpers to use the standard /v3/crud/{obj_type}/{id} paths, ensuring correct backend isolation context.
- Auth Scavenging: Implemented direct localStorage scavenging for 'x-account-id' in core fetch helpers to prevent hydration race conditions in Svelte 5.
- Header Cleanup: Purged redundant 'x-aether-api-token' and fixed misplaced protocol headers in global stores.
- Reliability: Fixed 'Content-Type' typos and standardized kebab-case header normalization.

src/lib/stores/ae_stores.ts

@@ -457,11 +457,8 @@ export const ae_api_data_struct: key_val = {
 };
 
 const ae_api_headers: key_val = {};
-ae_api_headers['Access-Control-Allow-Origin'] = '*';
-ae_api_headers['Content-Yype'] = 'application/json';
+ae_api_headers['Content-Type'] = 'application/json';
 ae_api_headers['x-aether-api-key'] = ae_api_data_struct.api_secret_key;
-ae_api_headers['x-aether-api-token'] = 'fake-temp-token';
-ae_api_headers['x-aether-api-expire-on'] = '';
 if (ae_account_id) {
     ae_api_headers['x-account-id'] = ae_account_id;
 } else {