formatting + adding issues

README.md

@@ -30,7 +30,7 @@ Live at [lilastudy.com](https://lilastudy.com).
 
 ## Repository Structure
 
-```
+```tree
 lila/
 ├── apps/
 │   ├── api/        — Express backend
@@ -50,7 +50,7 @@ lila/
 
 Requests flow through a strict layered architecture:
 
-```
+```text
 HTTP Request → Router → Controller → Service → Model → Database
 ```
 
@@ -71,7 +71,7 @@ Vocabulary data is sourced from WordNet and the Open Multilingual Wordnet (OMW).
 
 ## API
 
-```
+```text
 POST /api/v1/game/start     — start a quiz session (auth required)
 POST /api/v1/game/answer    — submit an answer (auth required)
 GET  /api/v1/health         — health check (public)
@@ -90,7 +90,7 @@ Rooms are created via REST, then managed over WebSockets. Messages are typed via
 
 ## Infrastructure
 
-```
+```tree
 Internet → Caddy (HTTPS)
             ├── lilastudy.com      → web (nginx, static files)
             ├── api.lilastudy.com  → api (Express)