docs: api comments say what the endpoints do, not how they came to be (#6277)

Rewrites the internal/api comment blocks to rule 32: task, milestone and
rule ids gone, the stories behind them restated as the constraint they
left, stale references corrected (the stream secret is wired from config,
the timezone handler already refreshes the scheduler, the Android app is
the native client, the design docs cited are not in the repo). Also
rewraps comment lines over 80 columns left by the earlier batches.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/api/admin_requests.go

@@ -90,15 +90,15 @@ func requesterNames(ctx context.Context, q *dbq.Queries, rows []dbq.Request) map
 	return names
 }
 
-// approveRequestBody is the optional JSON body for POST /api/admin/requests/:id/approve.
-// profile_id picks the release-type profile an artist request is followed
-// on; omitted, the default profile.
+// approveRequestBody is the optional JSON body for POST
+// /api/admin/requests/:id/approve. profile_id picks the release-type profile an
+// artist request is followed on; omitted, the default profile.
 type approveRequestBody struct {
 	ProfileID string `json:"profile_id"`
 }
 
 // handleApproveRequest implements POST /api/admin/requests/:id/approve. The
-// request goes on the wanted list (M502 #5520): an album or track request
+// request goes on the wanted list: an album or track request
 // wants its album, an artist request follows the artist.
 func (h *handlers) handleApproveRequest(w http.ResponseWriter, r *http.Request) {
 	admin, ok := auth.UserFromContext(r.Context())
@@ -147,7 +147,8 @@ func (h *handlers) handleApproveRequest(w http.ResponseWriter, r *http.Request)
 	writeJSON(w, http.StatusOK, requestViewFrom(row))
 }
 
-// rejectRequestBody is the optional JSON body for POST /api/admin/requests/:id/reject.
+// rejectRequestBody is the optional JSON body for POST
+// /api/admin/requests/:id/reject.
 type rejectRequestBody struct {
 	Notes string `json:"notes"`
 }