feat: add reviewed follow-up audio patient enrichment

server/.env.followup-audio.example

@@ -0,0 +1,16 @@
+# Merge this section into the target environment's existing .env. No credentials are provided here.
+# Existing [prescription_ai] configuration is reused, not replaced.
+[followup_audio]
+ENABLED = false
+AUDIO_VERIFIED = false
+VERIFIED_PROFILES =
+PROFILE = qwen
+CONCURRENCY = 1
+REQUEST_TIMEOUT = 240
+UPSTREAM_MAX_BYTES = 20971520
+NORMALIZE_TIMEOUT = 120
+FFMPEG = ffmpeg
+FFPROBE = ffprobe
+# At least 32 characters; keep secret, stable, backed up and identical on web/worker nodes.
+# Empty uses the existing prescription_analysis key; never rotate without a data re-encryption plan.
+ENCRYPTION_KEY =