feat(core): implement wallet trade tracking and sqlite market caching

- Transitioned primary ESI networking and dataset initialization to `asyncio` and `aiohttp` for non-blocking I/O.
- Introduced `aiosqlite` utilizing an in-memory database to significantly speed up arbitrage querying.
- Implemented character wallet tracking (added `esi-wallet.read_character_wallet.v1` scope) to automatically deduct filled market volumes internally instead of waiting for full region polling.
- Exposed `/settings` endpoint allowing dynamic tweaking of threshold variables (cargo size, limits, tax rate, ship speeds) directly from the React UI.
- Decoupled auto-waypoint submission during route planning; users now push routes selectively via a new "Set in Game" frontend action and `/set_waypoints` backend logic.
- Optimized order evaluations and triplet generation limits through `LegMetrics` to lower CPU footprint drastically on large dataset passes.
- Migrated React frontend completely to Server-Sent Events (SSE), cleanly ditching HTTP polling.

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