Modularize cogs, harden database and bot core, add utilities and new features

[Gamming-SERVICE]

Motivation

• Move to a modular, type-hinted cog structure and improve maintainability by splitting features into separate files.
• Harden database handling and migrations so older DB schemas remain compatible and new features (invite tracking, market) have persistent storage.
• Improve startup robustness and security by centralizing token resolution and loading cogs dynamically.
• Provide small utility helpers and update configuration and dependencies for a modern runtime.

Description

• Added many new cogs (admin, ai, economy, events, fun, giveaway, invite_tracker, leveling, market, moderation updates, music cleanup, tickets, utility, waifu) and removed/merged the old marketplace to market for a more consistent API surface.
• Rewrote database.py to expose DB_PATH, implement init_database() with schema creation and backward-compatible migrations, and robust get_user_data / update_user_data helpers handling composite PKs.
• Reworked main.py into IntentBot with _resolve_token() (environment-first token), updated intents, improved setup_hook to load all cogs, and an async main() run loop with clear error handling on login failure.
• Created utils.py for common helpers (create_embed, parse_time), expanded config.py to read token from environment and clarified settings, and updated requirements.txt with required runtime packages.
• Improved error handling and timeouts for external AI HTTP calls, added response chunking for long messages, tightened permissions checks, and added type hints across the codebase.

Testing

• No automated tests were run as part of this change set.

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