feat: read the profile's topics from Studio, and add working-copy deletion

Two things an author could not control from Studio.

The profile's "주요 관심 주제" was four strings in the JSX. Creating or removing
a topic in Studio changed nothing, and correcting the list meant a rebuild and
a redeploy. It now renders the published topic list. The old literal opened
with "Backend Architecture", which no record in the catalogue actually carries
— the profile was advertising a topic that did not exist, and nothing could
have caught that while the list lived in the markup.

The working-copy list gained a delete control. It routes by kind because the
contract and the storage both do: Case and Reference share one table split by
type, Question is its own. Decision has no delete — its lifecycle is accept,
reject, supersede, which records what happened rather than erasing it — so the
control does not appear for it.

The list summary carries no version, so deletion reads the working copy first
and uses the version it finds. A stale version from a list left open should
fail as a conflict, not delete whatever is there now.

src/features/tech-log/adapters/http/http-public-content-gateway.ts

@@ -5,6 +5,7 @@ import type {
   Project,
   PublicContentQueries,
   PublicRecord,
+  PublicTopic,
   QuestionRecord,
   RecordFilters,
   RecordKind,
@@ -292,6 +293,18 @@ export function createHttpPublicContentGateway(
    * one object with a named slot per kind rather than a list, because each slot
    * has its own shape; the order below is the order the screen renders them in.
    */
+  async function listTopics(): Promise<PublicTopic[]> {
+    const page = await read<Page>("listPublicTopics", {});
+    if (page === NOT_FOUND) return [];
+    return (page.items ?? []).map((item) =>
+      Object.freeze({
+        name: String(item.name ?? ""),
+        slug: String(item.slug ?? ""),
+        recordCount: Number(item.recordCount ?? 0),
+      }),
+    );
+  }
+
   async function getHomeFocusItems(): Promise<HomeFocusItem[]> {
     const home = await read<Readonly<{ focus?: Readonly<Record<string, never>> }>>(
       "getPublicHome",
@@ -430,6 +443,7 @@ export function createHttpPublicContentGateway(
     getRecord,
     getProject,
     getRelease,
+    listTopics,
     getProjectRecords,
     getProjectDecisions,
     getProjectActivity,