@chore(release): bump version to 3.8.0 (issue #111)

Game-creation wizard: replace /newsession text template with step-by-step
inline-keyboard flow for single games and game pools.

- Directory.Build.props: 3.7.1 -> 3.8.0
- compose.yaml: pin bot, discord-bot and web images to 3.8.0
- deploy.yml VERSION env: 3.7.1 -> 3.8.0
- NavMenu.razor: nav-version 3.7.1 -> 3.8.0

🤖 Generated with Claude Code
@

compose.yaml

@@ -49,7 +49,7 @@ services:
         crond -f
 
   bot:
-    image: git.codeanddice.ru/toutsu/gmrelay-bot:3.7.1
+    image: git.codeanddice.ru/toutsu/gmrelay-bot:3.8.0
     restart: always
     depends_on:
       db:
@@ -67,7 +67,7 @@ services:
       retries: 3
 
   discord:
-    image: git.codeanddice.ru/toutsu/gmrelay-discord-bot:3.7.1
+    image: git.codeanddice.ru/toutsu/gmrelay-discord-bot:3.8.0
     restart: always
     depends_on:
       db:
@@ -86,7 +86,7 @@ services:
       retries: 3
 
   web:
-    image: git.codeanddice.ru/toutsu/gmrelay-web:3.7.1
+    image: git.codeanddice.ru/toutsu/gmrelay-web:3.8.0
     restart: always
     depends_on:
       db: