Add the Academy: narrated, animated roasting & brewing lessons; cupping link on roast detail

Academy (/academy, 'Learn' nav group):
- 10 lessons / 45 slides across two tracks. Roasting: seed anatomy and
  composition, drying & the turning point, Maillard, first crack &
  development (DTR), curve/RoR reading (crash, flick, stall), defects →
  one-change discipline. Brewing: extraction physics (dissolving order,
  yield, grind, temp/time/ratio), then technique per brewer family —
  immersion (French press, AeroPress, Clever/Hario Switch, cold brew,
  cupping), percolation (bloom, V60, Chemex/Kalita, batch, percolator),
  espresso & pressure (puck prep, shot reading, dialing in, moka)
- One cohesive scene system: 25 parameterized animated SVG scenes drawn
  from the app's palette (beans, curves, phase bars, brewers reusing the
  silhouette library), CSS keyframe animations, reduced-motion support
- Narration: Azure TTS (en-US-Andrew HD, eastus) pre-generated to 45
  committed MP3s by scripts/generate-academy-audio.mjs; slides speak
  phonetic respellings (my-YARD, KEM-ex, MOH-kah…) while captions show
  normal spelling; hands-free autoplay advances after each clip
- Player: slide dots, keyboard arrows/space, per-slide captions

Roast detail: 'Open cupping session' button next to cup notes (opens or
creates the linked plan's session) — its score and flavors flow into
the updated .alog download.

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

README.md

@@ -36,6 +36,13 @@ A fillable, live-computing web version of the manual coffee roast plan worksheet
   it back transactionally (delete-and-restore, refuses backups with no active admin, keeps
   the importing admin's session when possible). Users can download their own data from the
   Account page.
+- **Academy** — `/academy` teaches roasting and brewing as narrated, animated slide lessons:
+  green-bean physics through every roast stage (drying, Maillard, first crack, development,
+  curve reading, defects) and extraction plus technique for every brewer family. Narration is
+  Azure TTS (`en-US-Andrew` HD voice), pre-generated to committed MP3s by
+  `scripts/generate-academy-audio.mjs` (reads `AZURE_VOICE_KEY`/`AZURE_VOICE` from `.env`,
+  region eastus — run it locally after editing lesson scripts; production never needs the
+  key). Slides carry display transcripts as captions and phonetic respellings for the voice.
 - **Live ledger** — the worksheet's time-ledger math (first crack, yellow, Maillard,
   development, drop, and the four sanity-check ratios) recomputes as you type, using the
   exact same arithmetic as the paper worksheet (verified against both its worked examples).