feedback7 G-TOOLS: add the battle performance bench under public/dev (PR #198 by @Cloudnyco)

Applied as-is. Captured real battles live in public/dev/perf (including the round-13 联防 on the wide round battlefield), with a browser speed page and a headless benchmark. public/dev stays out of the package. The Chrome benchmark was not run. The numbers in the original pull request are from 0.1.4 and are not quoted here.

Tests: node --test test/perfbench.test.js test/render/battle-perf.browser.test.js — 13 pass, 0 fail; the Chrome suite skipped (RENDER_E2E unset).

public/dev/perf/index.json

@@ -0,0 +1,38 @@
+[
+ {
+  "name": "hard-normal-r13",
+  "title": "普通战 · 第 13 回合",
+  "kind": "normal",
+  "round": 13,
+  "stageId": "act2autochess_m01",
+  "players": 1,
+  "units": 8
+ },
+ {
+  "name": "hard-unite-r13",
+  "title": "联防 · 第 13 回合",
+  "kind": "unite",
+  "round": 13,
+  "stageId": "act2autochess_m01",
+  "players": 2,
+  "units": 16
+ },
+ {
+  "name": "hard-boss-r14",
+  "title": "最终攻势 · 第 14 回合",
+  "kind": "boss",
+  "round": 14,
+  "stageId": "act2autochess_m01",
+  "players": 2,
+  "units": 16
+ },
+ {
+  "name": "hard-hidden-r15",
+  "title": "隐秘核心 · 第 15 回合",
+  "kind": "hidden",
+  "round": 15,
+  "stageId": "act2autochess_m01",
+  "players": 2,
+  "units": 16
+ }
+]