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

tests/unit/dependencies.py

@@ -77,7 +77,7 @@ def test_formdata_list_field_mixed_empty_and_real():
 
 def test_formdata_literal_fields_are_scalar():
     """Literal-typed fields (e.g. target_type in CommentForm) are treated as
-    scalars — the origin check must not crash on typing.Literal."""
+    scalars - the origin check must not crash on typing.Literal."""
     fd = FormData([
         ("content", "Great comment here!"),
         ("target_type", "post"),
@@ -108,14 +108,14 @@ def test_formdata_literal_form_from_browser():
 
 
 def test_formdata_vote_form():
-    """value: int field with form data — string '1' is kept for Pydantic coerce."""
+    """value: int field with form data - string '1' is kept for Pydantic coerce."""
     fd = FormData([("value", "1")])
     body = _formdata_to_dict(fd, VoteForm)
     assert body["value"] == "1"  # Pydantic coerces str→int
 
 
 def test_formdata_issue_status_literal():
-    """IssueStatusForm has Literal['open','closed'] — must not crash."""
+    """IssueStatusForm has Literal['open','closed'] - must not crash."""
     fd = FormData([("status", "open")])
     body = _formdata_to_dict(fd, IssueStatusForm)
     assert body["status"] == "open"