feat(v3): harden clean ID pattern and standardize snake_case platform-wide

- Systematically migrated from *_id_random to clean *_id fields in BB, People, and Posts modules.
- Synchronized Post_Comment interface with account_id for multi-tenant isolation.
- Applied optional chaining and local reactive state to harden async UI initialization.
- Refactored common helpers to follow snake_case naming conventions.
- Resolved various minor stability and logic issues across IDAA Bulletin Board.

src/lib/types/ae_types.ts

@@ -740,9 +740,9 @@ export interface ae_DataStore extends ae_BaseObj {
  */
 export interface ae_Post extends ae_BaseObj {
     post_id: string;
-    post_id_random: string;
+    // post_id_random: string;
     account_id: string;
-    account_id_random: string;
+    // account_id_random: string;
 
     title: string;
     content: string;
@@ -762,8 +762,9 @@ export interface ae_Post extends ae_BaseObj {
  */
 export interface ae_PostComment extends ae_BaseObj {
     post_comment_id: string;
-    post_comment_id_random: string;
-    post_id_random: string;
+    // post_comment_id_random: string;
+    post_id: string;
+    // post_id_random: string;
 
     content: string;
     anonymous: boolean;
@@ -787,7 +788,7 @@ export interface ae_Page extends ae_BaseObj {
 
 /**
  * Archive - A collection of archival content
- * Related Files: 
+ * Related Files:
  * - src/lib/ae_archives/db_archives.ts (Dexie Interface)
  * - src/routes/idaa/(idaa)/archives/[archive_id]/+page.svelte (View)
  */