Implement Energy System - Player energy depletes when fishing and restores when sleeping

[Copilot]

Implements a complete energy system for the FishE game as requested in issue #X. Players now have an energy meter that adds strategic resource management to the fishing gameplay.

Changes Made

Core Energy Mechanics:

• Players start with 100 energy points
• Fishing consumes 10 energy per hour spent fishing
• Players cannot fish when energy drops below 10 (shows helpful message)
• Sleeping restores energy to full (100) and advances to the next day

UI Updates:

• Energy display added to the status bar alongside money and fish count
• Clear feedback when energy is too low to perform actions

Data Persistence:

• Energy is properly saved/loaded with player data
• Backwards compatibility maintained for existing save files (defaults to 100 energy)
• Updated JSON schema to include energy validation

Testing:

• Added comprehensive test coverage for all energy system functionality
• All existing tests continue to pass (maintains backwards compatibility)
• Manual testing confirms proper energy consumption and restoration mechanics

Example Gameplay

Day 1 | 8:00 AM | Money: $20 | Fish: 0 | Energy: 100
[Player goes fishing for 4 hours]
Day 1 | 2:00 PM | Money: $20 | Fish: 3 | Energy: 60
[Player continues fishing until exhausted]
Day 1 | 8:00 PM | Money: $20 | Fish: 8 | Energy: 0
[Attempting to fish shows: "You're too tired to fish! Go home and sleep."]
[Player sleeps]
Day 2 | 8:00 AM | Money: $20 | Fish: 8 | Energy: 100

Screenshot

The energy system adds meaningful resource management while preserving the game's existing feel. Players must now balance fishing activities with rest, making sleep a strategic choice rather than just a time advancement mechanism.

Files Changed:

• src/player/player.py - Added energy attribute
• src/player/playerJsonReaderWriter.py - Energy serialization support
• src/ui/userInterface.py - Energy display in status bar
• src/location/docks.py - Energy consumption and low-energy prevention
• src/location/home.py - Energy restoration when sleeping
• schemas/player.json - Schema updates for energy validation
• Tests updated and added for comprehensive coverage

All 61 tests pass, ensuring the energy system works correctly while maintaining existing functionality.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Energy System</issue_title>
<issue_description>The player should have a certain amount of energy which gets depleted when performing actions and can be replenished by sleeping.</issue_description>

Comments on the Issue (you are @copilot in this section)

Fixes #18

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[dmccoystephenson]

@copilot Expand unit tests