Attribute Devii AI spend to its invoking action, fix quiz question-at-a-time review, DB API/isslop result routes, workspace docs, and drop redundant docstrings

- Route Devii-driven AI gateway cost to the action/tool that triggered
  it instead of a blanket "internal" bucket, so per-feature AI spend
  is attributable.
- Fix the quiz attempt review to show one previously-answered question
  at a time instead of all of them at once, and stop a quiz endpoint
  linked from the quiz flow from responding with raw JSON.
- Add DB API async query result route and AI Usage Analyzer annotated
  source/media routes, with traversal-safe uid/path handling and
  matching tests.
- Add Code Farm action audit logging (plant/harvest/buy-plot/upgrade/
  fertilize) and related admin workspace/services/trash/gateway route
  and doc touch-ups.
- Drop redundant docstrings from access_tokens.py per the no-comments
  convention.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01VL9Xn57W5UR3HZbbuuzxdK

README.md

@@ -63,6 +63,7 @@ devplacepy/
 | `/` | Home page: marketing splash for guests, personalized home (welcome, feed shortcut, latest posts, news) for signed-in users. Does not redirect. Latest-posts section interleaves authors so no two consecutive posts share an author. |
 | `/auth` | Signup, login, logout, forgot/reset password |
 | `/feed` | Post feed with topic/tab filtering and free-text `search` (title, content, and author username) in the left panel (public). Each page interleaves authors so no two consecutive posts share an author. |
+| `/topics` | Crawlable per-topic category pages (public): `/topics` hub links every topic with a live post count, `/topics/{topic}` lists that topic's posts with its own canonical URL, title, and breadcrumbs |
 | `/news` | Developer news listing, detail page with comments |
 | `/posts` | Post detail, creation |
 | `/gists` | Code gist listing, detail, creation, and editing; left panel offers language filtering and free-text `search` (title, description, and author username), public read |
@@ -974,7 +975,7 @@ subscription is kept. APNs environment is stored per registration so a sandbox d
 token and a production token can coexist.
 
 A notification is also **marked read automatically when you open the page that shows its
-content** - viewing a post clears its comment, reply, upvote and mention notifications;
+content** - viewing a post clears its comment, reply, thread, upvote and mention notifications;
 opening a conversation clears its direct-message notifications; visiting a profile clears
 the matching follow, badge and level notifications; and the issue, reminder and farm-raid
 notifications clear on their respective pages. You no longer have to dismiss each one by