refactor: extract star/notification/badge helpers into database.py and add enrich_items content module

Introduce `update_target_stars`, `get_target_owner_uid`, and `VOTABLE_TARGETS`/`STAR_TARGETS` in database.py; replace inline badge insertion with `award_badge()` and inline notification creation with `create_notification()` across auth, comments, and follow routers; add `enrich_items()` in new content module to centralize post/gist list assembly and remove duplicated enrichment logic from feed and gists routers.

devplacepy/static/js/VoteManager.js

@@ -1,3 +1,5 @@
+import { Http } from "./Http.js";
+
 export class VoteManager {
     constructor() {
         this.initVoteButtons();
@@ -6,37 +8,22 @@ export class VoteManager {
 
     initVoteButtons() {
         document.querySelectorAll(".post-action-btn[data-vote]").forEach((btn) => {
-            btn.addEventListener("click", async () => {
+            btn.addEventListener("click", () => {
                 const targetUid = btn.dataset.target;
                 const targetType = btn.dataset.type || "post";
-                const value = btn.dataset.vote;
-
-                const form = document.createElement("form");
-                form.method = "POST";
-                form.action = `/votes/${targetType}/${targetUid}`;
-                const input = document.createElement("input");
-                input.type = "hidden";
-                input.name = "value";
-                input.value = value;
-                form.appendChild(input);
-                document.body.appendChild(form);
-                form.submit();
+                Http.postForm(`/votes/${targetType}/${targetUid}`, { value: btn.dataset.vote });
             });
         });
     }
 
     initNotificationDismiss() {
         document.querySelectorAll(".notification-dismiss").forEach((btn) => {
-            btn.addEventListener("click", async () => {
+            btn.addEventListener("click", () => {
                 const uid = btn.dataset.uid;
                 if (!uid) {
                     return;
                 }
-                const form = document.createElement("form");
-                form.method = "POST";
-                form.action = `/notifications/mark-read/${uid}`;
-                document.body.appendChild(form);
-                form.submit();
+                Http.postForm(`/notifications/mark-read/${uid}`);
             });
         });
     }