fix(deploy): add reservations to workers in optical-dev — prevent limit < reservation OOM error

whisper-worker base has reservation 4G, optical-dev limit 2G causes Docker error.
Added explicit reservations to all three pipeline workers.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.optical-dev.yml

@@ -81,6 +81,9 @@ services:
         limits:
           memory: 1G
           cpus: '0.5'
+        reservations:
+          memory: 256M
+          cpus: '0.1'
 
   tts-worker:
     deploy:
@@ -89,6 +92,9 @@ services:
         limits:
           memory: 512M
           cpus: '0.25'
+        reservations:
+          memory: 128M
+          cpus: '0.1'
 
   whisper-worker:
     deploy:
@@ -97,3 +103,6 @@ services:
         limits:
           memory: 2G
           cpus: '0.5'
+        reservations:
+          memory: 512M
+          cpus: '0.25'