Allow up to seven teams for players (#445)

## Description:

- Allow up to seven teams for players, and one for bots.
- Add team count selection to the single player dialog.
- Select random number of teams in server rotation.

Fixes #456

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced
- [x] I understand that submitting code with bugs that could have been
caught through manual testing blocks releases and new features for all
contributors


![image](https://github.com/user-attachments/assets/cbc1ba82-9d06-4763-896c-abdce067a161)


![image](https://github.com/user-attachments/assets/9f82a0a5-c0bb-49b6-a714-2b13286a64ca)

## Please put your Discord username so you can be contacted if a bug or
regression is found:

fake.neo

---------

Co-authored-by: Scott Anderson <662325+scottanderson@users.noreply.github.com>

src/core/Schemas.ts

@@ -121,6 +121,7 @@ const GameConfigSchema = z.object({
   infiniteTroops: z.boolean(),
   instantBuild: z.boolean(),
   maxPlayers: z.number().optional(),
+  numPlayerTeams: z.number().optional(),
 });
 
 const SafeString = z