Implement role-specific night actions [Copilot Workspace]

[sadrasabouri]

Related to #7

Implements role-specific action fields for night actions and updates server logic to handle these actions.

• Player Interface Update: Adds conditional rendering in templates/Player.html to display action fields (Night Kill, Detection, Save) based on the player's role. Players can now select targets for their night actions directly within the game interface.
• Server Logic Enhancement: Updates mafia.py to include a new route /night_action for processing night action requests. This includes handling 'kill', 'detect', and 'save' actions based on form submissions.
• Night Actions Processing: Introduces a placeholder function /process_night_actions in mafia.py for future implementation of night actions processing logic. Also, initializes a night_actions dictionary to store these actions temporarily.
• General Improvements: Ensures that action fields are only shown to players marked as "alive" and dynamically updates the player's interface based on their actions during the night phase.

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For more details, open the Copilot Workspace session.