Implement obscenity filter for lobby names and user names

[Copilot]

Fixes #29 by implementing comprehensive obscenity filtering for both lobby names and user names using the obscenity library with English dataset validation.

Changes Made

Server-side Implementation

• Added obscenity filtering utility (server/src/utils/obscenity-filter.ts) with proper API configuration using RegExpMatcher and English dataset
• Enhanced user registration to validate usernames against profanity in addition to existing format validation
• Added lobby name support - lobbies now require names instead of being identified only by creator
• Updated lobby creation API to accept and validate lobby names with obscenity filtering
• Comprehensive test coverage with 31 passing tests including edge cases for profanity detection

Client-side Implementation

• Added matching client-side obscenity filter with identical validation rules to server
• Enhanced CreateLobbyForm to include required lobby name input with real-time validation feedback
• Updated RegisterUserForm with client-side profanity validation before submission
• Improved LobbyList UI to display lobby names prominently with creator information

Type System Updates

• Extended shared types to include lobby names in CreateLobbyDto and LobbySummaryDto
• Added name field to Lobby interface and related data structures
• Resolved module dependencies using local type definitions to avoid linking issues

Technical Details

The implementation uses the obscenity library's RegExpMatcher with:

• English dataset with blacklisted and whitelisted terms
• Recommended transformers for comprehensive pattern matching
• Case-insensitive detection of inappropriate content
• Consistent validation between client and server

Validation Examples

// These will be rejected:
createLobby({ name: "fuck chess", password: "123" })  // ❌ Profanity detected
registerUser({ name: "shit", password: "password" })  // ❌ Profanity detected

// These will be accepted:
createLobby({ name: "Chess Masters", password: "123" })  // ✅ Clean content
registerUser({ name: "player123", password: "password" })  // ✅ Clean content

Testing

All tests pass including:

• Obscenity filter unit tests with clean and inappropriate content
• User registration with profanity validation
• Lobby creation with name requirements and profanity filtering
• Integration tests ensuring client/server consistency

The implementation provides robust protection against inappropriate content while maintaining a smooth user experience with clear error messaging.

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[mterczynski]

Why this new file

[mterczynski]

Should me moved to /shared for consistency between client and server

[mterczynski]

As above, should be moved to /shared

[mterczynski]

Needs adjustments