fix: update formatters which were tied to outdated fields

[rsned]

The big finding: several formatters are broken because the server response structure
changed from what the formatters expect:

│  Command   │       Formatter expects       │      Server actually returns      │
|---|---|---|
│ get_system │ r.id && r.pois &&             │ r.system, r.poi,                  │
│            │ r.connections                 │ r.security_status                 │
│ get_poi    │ r.id && r.type && r.system_id │ r.poi, r.resources                │
│ get_cargo  │ r.cargo && r.cargo_used       │ r.cargo, r.used, r.capacity,      │
│            │                               │ r.available                       │
│ get_nearby │ Array.isArray(r.players)      │ r.nearby, r.pirates, r.count      │

- System info: read from r.system wrapper, display rich POI/connection data
- POI info: read from r.poi wrapper, show base details and services
- Cargo: field renamed from cargo_used to used
- Nearby: match r.nearby array, add pirate/NPC sections, player colors
- Add hexColor() helper for 24-bit ANSI terminal colors from player data
- Remove player ID lines from nearby output for cleaner display

[rsned]

$ bun run src/client.ts get_nearby

=== Nearby ===

Players (8):
  Kurarin.44 (prospector)
  MoltBot01 (prospector)
  Kurarin.Joker [KURA] (theoria) - "🃏 The cards of fate have been dealt. Destiny awaits."
  Hi-xi III [HEXC] (caravan)
  AuroraMiner (theoria)
  Kurarin.46 [KURA] (prospector)
  DM7-drone-010 [DMX7] (excavator)
  Cinder Wake [QTCG] (theoria)

Empire NPCs (1):
  [POLICE] Confederacy Patrol I - Confederacy Central Command (precept)

robert@dev:~/spacemolt/official_client/client$ smc  get_nearby

=== Response ===
{
  "nearby": [
    {
      "player_id": "da98c5498c10186bacd9048c0ec1e999",
      "username": "Kurarin.44",
      "primary_color": "#FFFFFF",
      "secondary_color": "#000000",
      "ship_class": "prospector",
      "in_combat": false
    },
...

get_system

$ bun run src/client.ts get_system

=== System: Sol ===
ID: sol
Empire: solarian
Police Level: 100 (Maximum Security (empire capital))
Description: The birthplace of humanity. Heart of the Solarian Confederacy.

Points of Interest:
  - Sol Star (sun) (15 online)  sol_star
  - Mercury (planet)  mercury
  - Venus (planet)  venus
  - Earth (planet) (2 online)  earth
  - Sol Central (station) [base] (874 online)  sol_central
  - Mars (planet) (4 online)  mars
  - Main Belt (asteroid_belt) (216 online)  main_belt
  - Jupiter (planet)  jupiter
  - Jovian Extraction Zone (gas_cloud) (2 online)  jovian_extraction_zone
  - Saturn (planet) (1 online)  saturn
  - Uranus (planet) (1 online)  uranus
  - Neptune (planet)  neptune
  - Kuiper Ice Fields (ice_field) (3 online)  kuiper_ice_fields

Connected Systems:
  - Sirius (715 ly)  sirius
  - Alpha Centauri (279 ly)  alpha_centauri

Current POI: Main Belt (asteroid_belt)  main_belt

$ smc  get_system

=== Response ===
{
  "action": "get_system",
  "system": {
    "id": "sol",
    "name": "Sol",
    "description": "The birthplace of humanity. Heart of the Solarian Confederacy.",
    "empire": "solarian",
    "police_level": 100,
    "security_status": "Maximum Security (empire capital)",
    "pois": [
      {
        "id": "sol_star",
        "name": "Sol Star",
        "type": "sun",
        "class": "G2V",
        "position": {
          "x": 0,
          "y": 0
        },
        "has_base": false,
        "online": 15
      },
      {
        "id": "mercury",

get_cargo

robert@dev:~/spacemolt/official_client/client$ bun run src/client.ts get_cargo

=== Cargo ===
Used: 3/70 (67 available)

  3x Nickel Ore (1 each)


$ smc  get_cargo

=== Response ===
{
  "cargo": [
    {
      "item_id": "nickel_ore",
      "name": "Nickel Ore",
      "quantity": 3,
      "size": 1
    }
  ],
  "used": 3,
  "capacity": 70,
  "available": 67
}

[rsned]

get_poi

=== POI: Main Belt ===
ID: main_belt
Type: asteroid_belt
System: sol
Description: Rich asteroid field between Mars and Jupiter. Contains rare Sol Alloy deposits.
Class: metallic

Resources:
  - Iron Ore: richness 80, depleted
  - Copper Ore: richness 60, 18/100000 (0.02% remaining)
  - Nickel Ore: richness 70, depleted
  - Titanium Ore: richness 25, 12/25000 (0.05% remaining)
  - Sol Alloy Ore: richness 15, 5/5000 (0.10% remaining)
  - Antimatter Containment Cell: richness 5, depleted
robert@dev:~/spacemolt/official_client/client$ 

[rsned]

It now warns when the formatter no longer triggers for a given command as well:

[DRIFT WARNING] 'travel' response has keys matching formatter(s) [system_info, poi_info] but none matched. Response keys: [action, online_players, online_players_count, online_players_truncated, poi, poi_id]