fix(render): show exact remaining ammunition

Reference: lolink’s numeric ammunition display in https://github.com/Yilegendoflink/garrison-protocol/commit/071ed14aa27d5ebf54e57447c958f2681737403c. This implementation uses the existing PIXI HUD and exact snapshot counts; no fork code is copied.

public/js/render/units.js

@@ -760,6 +760,7 @@ export class UnitView {
     this.blockIcon.visible = false;
     this.ctx.layers.groundFx.addChild(this.blockIcon);
     this.countText = null;
+    this.ammoText = null;
     this.itemPips = [];
   }
 
@@ -1413,7 +1414,8 @@ export class UnitView {
     }
     // 狼影 pips under the bars (b.snap `wolves`), then the element gauge row under them (b.snap `elem`); redeploy ring above a
     // knocked-down operator (b.snap `down`)
-    const rowsTop = cy + bh / 2 + (showSp ? spH + 1.5 : 0);
+    let rowsTop = cy + bh / 2 + (showSp ? spH + 1.5 : 0);
+    rowsTop += this._updateAmmoText(showSp && !!ammo, x0 + bw / 2, rowsTop, s);
     const wolfH = this._updateWolfPips(showBars && !this.isEnemy && !!this.wolves, x0, rowsTop, s);
     const coinH = this._updateCoins(showBars && !this.isEnemy && !!this.coins, x0, rowsTop + wolfH, s);
     this._updateElementBar(showBars && !!this.el, x0, bw, rowsTop + wolfH + coinH + 1, spH, s, t);
@@ -1441,6 +1443,22 @@ export class UnitView {
     }
   }
 
+  /** Exact snapshot counts, including extra rounds and refills; readable even when the cells are too narrow. */
+  _updateAmmoText(show, x, top, s) {
+    let text = this.ammoText;
+    if (!show) { if (text) text.visible = false; return 0; }
+    if (!text) {
+      text = this.ammoText = new this.P.Text('', { fontFamily: 'Bender, Oxanium, sans-serif', fontSize: 16, fontWeight: '700', fill: COLORS.ammo, stroke: '#0b0f0e', strokeThickness: 3 });
+      text.anchor.set(0.5, 0);
+      this.hud.addChild(text);
+    }
+    text.text = `${this.ammo[0]}/${this.ammo[1]}`;
+    text.scale.set(clamp(s * 0.2, 10, 16) / 16);
+    text.position.set(x, top + 3);
+    text.visible = true;
+    return text.height + 6;
+  }
+
   /**
    * The thin dark separators between the ammo bar's cells (see _updateHud): one at every round boundary of the `n`-round
    * magazine across the bar `x0` … `x0 + bw` at height `y`, `h` tall; none while a cell would be under AMMO_BAR.minCell px