Add finished-roast .alog uploads with Pi agent deep review and /roasts history

- POST /api/roasts stores the original .alog verbatim (multiple per plan),
  parses it server-side, and kicks off an async zero-tool Pi agent review
  (grade, highlights, concerns, next-batch suggestions, plan-vs-actual)
- /roasts page: table of historical actual roasts with review summaries;
  row detail renders the BT curve as SVG with the plan curve overlaid,
  shows the full review, and offers original-.alog backup download,
  re-evaluate, and delete
- Planner's Reference curve drawer gains a multi-file finished-roast
  uploader that attaches to the open (synced) plan
- Failed reviews record the error on the row and are retryable via
  POST /api/roasts/:id/evaluate (e.g. once a model is configured)

Co-Authored-By: Claude Fable 5 <[email protected]>

public/admin.html

@@ -24,6 +24,10 @@
             ><span class="nav-icon" aria-hidden="true">▤</span
             ><span class="nav-label">Plans</span></a
           >
+          <a class="nav-item" href="/roasts"
+            ><span class="nav-icon" aria-hidden="true">∿</span
+            ><span class="nav-label">Roasts</span></a
+          >
           <a class="nav-item" href="/inventory"
             ><span class="nav-icon" aria-hidden="true">▥</span
             ><span class="nav-label">Inventory</span></a