feat(battleship): add full placement/battle phases + metadata support + action-based moves
- Added Battleship Fleet definition (carrier, battleship, cruiser, submarine, destroyer)
- Implemented action-based MovePayload (`action: "place" | "shoot"`)
- Added placement and shot validation (ValidatePlacementMove, ValidateShotMove)
- Added ApplyPlacement and ApplyShot with correct ship placement + hit/miss logic
- Added pX_placed, pX_ready tracking and phase switching (placement → battle)
- Added Metadata field to MatchState (for phase/ready tracking)
- Updated MatchInit to initialize placement phase and readiness flags
- Updated MatchLoop to enforce turn order only during battle phase
- Added debug logging for state broadcasts
- Fixed protobuf dependency marking as indirect
Vishesh 'ironeagle' Bangotra
0562d1e0c9