Implement knife round feature and skip veto option for BO1 matches

[Copilot]

This PR implements the requested knife round feature for Best of 1 (BO1) matches and adds the ability to skip voting phases for direct match setup, addressing the core functionality requested in the issue.

Features Added

Knife Round Implementation

• New configuration option: knife_round (boolean, default: false) enables knife rounds before match start
• Complete state machine integration: Added KnifeRound and WaitingForKnifeRoundDecision states with proper transitions
• Automatic knife round setup: Configures knife-only weapons, disables buy options, and sets appropriate round settings
• Team decision system: Winning team can choose to !stay or !switch sides after knife round
• G5 API integration: Sends knife_start and knife_won events for external systems
• Server integration: Added SetupKnifeRound() method with proper CS2 console commands

Skip Veto Feature

• New configuration option: skip_veto (boolean, default: false) bypasses map and team voting phases
• Direct match flow: When enabled, goes straight from team definition to map switching
• Maintains compatibility: Works with existing team modes and configurations

Enhanced Console Commands

The existing !stay and !switch commands now have dual functionality:

• During team voting: Vote to stay with current team or switch to opposite team
• After knife round: Vote to stay on current side or switch sides (only winning team can vote)

Configuration Examples

Basic knife round setup:

{
  "knife_round": true,
  "maplist": ["de_dust2"],
  "num_maps": 1
}

Quick match without voting:

{
  "skip_veto": true,
  "maplist": ["de_dust2"],
  "team1": { "players": {...} },
  "team2": { "players": {...} }
}

Combined knife round + no voting:

{
  "knife_round": true,
  "skip_veto": true,
  "maplist": ["de_dust2"]
}

Technical Implementation

State Machine Flow

MatchStarting → KnifeRound (if knife_round enabled)
KnifeRound → WaitingForKnifeRoundDecision (on round end)
WaitingForKnifeRoundDecision → MatchRunning (after team decision)

DefineTeams → SwitchMap (if skip_veto enabled, bypassing MapVote/TeamVote)

API Integration

• Added KnifeRoundStartedParams and KnifeRoundWonParams classes
• Extended IApiProvider with knife round event methods
• Implemented support in G5ApiProvider, JsonApiProvider, and ApiStats

Backward Compatibility

• All changes are opt-in via configuration flags
• Existing matches without these options work exactly as before
• Original test suite continues to pass

Testing

• Added comprehensive unit tests for knife round flow
• Added tests for skip veto functionality
• All existing tests continue to pass
• State machine transitions properly validated

Documentation

• Updated configuration documentation with new options
• Enhanced command documentation showing dual functionality
• Added examples for common use cases

Fixes #340.

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