Add real server pool, race roster overhaul, and ship energy system

Server browsing & matchmaking:
- HL2-style main menu (QUICK PLAY/SERVER SELECT/OPTIONS/PROFILE/QUIT)
  replaces the old CASUAL/RANKED tiles; RANKED removed end-to-end
  (menu, matchmaking-api's Mode.ranked queue path, MMR matching) until
  ranked is real.
- New menu/server_select.gd lists real servers from the matchmaking
  API's GET /servers and connects directly, retiring the old
  unreachable menu/server_browser.gd.
- Real game-server pool: NetworkManager.host_server() self-registers on
  boot and heartbeats every 8s with live player counts; API computes
  available/full status from player_count, and a background sweep marks
  any server offline once its heartbeat goes stale (catches a crashed
  server that never deregistered).
- Server-select rows get a live UDP ping probe (query port = game port
  + 10000) instead of trusting stale DB numbers; post-connect HUD shows
  live RTT off ENet's own peer stats.

Race roster overhaul:
- Swapped Terran/Mechanos/Vorg for the pivoted roster — Apex Dynamics,
  Inner Sphere Navy, Outer Rim Collective — each with a 3-ship
  Fighter/Gunner/Tank lineup, art cropped from concept sheets with
  background removal + orientation fixes per sheet.
- Live headcount + roster + "TEAM FULL" lock on the race-select screen,
  shared between the initial pre-spawn pick and the pause menu's live
  SELECT TEAM swap.
- Bot personalities (bots/bot_personality.gd): aggression/caution/
  accuracy/reaction/awareness traits rolled per bot instead of one
  fixed AI profile.

HUD additions:
- Player list (roster, teammates white/enemies yellow, bots flagged),
  kill feed, minimap, and explosion VFX on death.
- Health and energy now render as bars (hud/stat_bar.gd) instead of
  text in the top-left HUD.

Ship energy system:
- Per-role max energy (Fighter 100 / Gunner 150 / Tank 250), 75 energy
  per shot, flat regen (100 per 2.5s), fully server-authoritative and
  piggybacked on the existing per-tick state broadcast alongside health.
- New blue "mirrored" bar top-middle of the screen (hud/energy_bar.gd)
  whose fill drains from both edges toward the center instead of
  left-to-right.

Ship handling tuning:
- Turn rate reduced (4.0 -> 1.0 rad/s) so a quick tap no longer
  over-rotates; holding past 0.15s ramps to double speed (2.0 rad/s) for
  fast full turns, gated the same way damage already is so replay during
  reconciliation can't double-count the hold timer.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

overview/structure.md

@@ -9,8 +9,8 @@ spacewar/                        ← repo root
     ├── autoload/
     │   └── game_config.gd        ← autoload singleton (tuning values, player state, signals)
     ├── menu/
-    │   ├── main_menu.tscn/gd     ← entry point / main scene
-    │   ├── server_browser.tscn/gd ← server browser UI (built, not in active flow yet)
+    │   ├── main_menu.tscn/gd     ← entry point / main scene; HL2-style vertical nav
+    │   ├── server_select.tscn/gd ← server list UI, backed by matchmaking-api's GET /servers
     │   ├── pause_menu.tscn/gd    ← in-game pause overlay (ESC / Start button)
     │   └── team_select.tscn/gd   ← race + ship selection overlay (shown on world load)
     ├── ships/
@@ -19,6 +19,8 @@ spacewar/                        ← repo root
     │   └── bullet.tscn/gd        ← projectile
     ├── chat/
     │   └── chat_box.tscn/gd      ← WoW-style chat overlay (T=all, Y=team), added to world.tscn
+    ├── hud/
+    │   └── player_list.tscn/gd   ← top-left player roster (white=team, yellow=enemy, "(b)"=bot), added to world.tscn
     ├── bots/
     │   ├── bot_manager.gd         ← autoload; server-only bot fill (join/leave reconciliation)
     │   ├── bot_ai.gd              ← class_name BotAI; seek-nearest-enemy-and-shoot brain
@@ -47,6 +49,11 @@ spacewar/                        ← repo root
 MainMenu (Control)   ← main_menu.gd builds all UI in _ready()
 ```
 
+### `menu/server_select.tscn` — server list
+```
+ServerSelect (Control)   ← server_select.gd builds all UI in _ready(), fetches GET /servers
+```
+
 ### `world/world.tscn` — game world
 ```
 World (Node2D)              ← world.gd instances MAP_SCENE into MapContainer on _ready()
@@ -56,7 +63,8 @@ World (Node2D)              ← world.gd instances MAP_SCENE into MapContainer o
 │   └── HealthLabel
 ├── PauseMenu (CanvasLayer, layer=10)   ← menu/pause_menu.tscn
 ├── TeamSelect (CanvasLayer, layer=20)  ← menu/team_select.tscn; queue_free()s after selection
-└── ChatBox (CanvasLayer, layer=5)      ← chat/chat_box.tscn
+├── ChatBox (CanvasLayer, layer=5)      ← chat/chat_box.tscn
+└── PlayerList (CanvasLayer, layer=4)   ← hud/player_list.tscn
 ```
 
 ### `world/maps/map_01.tscn` — hand-painted map
@@ -95,14 +103,17 @@ Player (CharacterBody2D)   ← ship_movement.gd
 
 ```
 main_menu.tscn
-  ├── CASUAL → world.tscn
+  ├── QUICK PLAY → matchmaking queue (casual) → world.tscn
   │     ├── TeamSelect overlay: pick race (2 random of 3 offered)
   │     ├── TeamSelect overlay: pick ship
   │     └── Player spawns → game live
-  └── RANKED → disabled (coming soon)
+  ├── SERVER SELECT → server_select.tscn → pick a server → world.tscn (same TeamSelect flow)
+  ├── OPTIONS → stub, coming soon
+  ├── PROFILE → callsign-edit overlay (also auto-opens from QUICK PLAY if no callsign is set)
+  └── QUIT
 ```
 
-> **Note:** `server_browser.tscn` was built (Task 1) and is functional, but the current flow bypasses it — CASUAL goes directly to the world and TeamSelect handles name/race/ship. The server browser will be re-integrated when real multiplayer server listing is built. It still uses the old hardcoded-1280px layout style (see Display below) — not yet updated since it isn't reachable in the live flow.
+Ranked matchmaking is removed from the menu entirely (not just disabled) until it's real — see `CLAUDE.md` Current Tasks.
 
 ## Display