feat(cli): add native Bun backend support and Dockerfile.bun (#11039)

⭐4 — Suporte de backend nativo Bun + Dockerfile.bun multi-stage + fallback dinâmico de driver SQLite (better-sqlite3 prioritário sob Bun, bun:sqlite fallback; Node preservado) + correção de estabilidade do DAST CI smoke.
Validado a fundo (worktree board sobre tip): bun-support 4/4, typecheck:core limpo, dashboard-typecheck OK (220 dentro do baseline), open-sse-typecheck OK (5 pré-existentes), gate de runtime OK sob Node, changelog-integrity OK, file-size/complexity/cognitive/dead-code OK. Verificado que o driver preserva a cadeia Node/falback conforme AGENTS.md; teste bun-support presente. Baselines de typecheck removidos são ratchet honesto (erros não existem mais).
OBS: destravei 2 base-reds do tip neste turno (push direto 7ffa3ef): movi o changelog fragment da #11050 da seção inválida breaking/ para fixes/, e rebaselinei AddApiKeyModal 1067->1073 (crescimento da #11056). Sem isso a #11039 e o resto da fila ficariam vermelhos.

scripts/build/build-next-isolated.mjs

@@ -131,12 +131,12 @@ function runNextBuild() {
 }
 
 export function resolveNextBuildBundlerFlag(baseEnv = process.env) {
-  // Turbopack is the default production bundler (Next 16 stable). Benchmarked on
-  // this codebase: 2-3x faster than the single-threaded webpack pass (17min -> 9min
-  // on a 32-core box; ~20min -> 7min on ubuntu-latest), artifact validated
-  // end-to-end (standalone smoke + e2e/package/electron CI jobs). Webpack stays as
-  // the explicit escape hatch (=0) for bundler-compat regressions.
-  return baseEnv.OMNIROUTE_USE_TURBOPACK === "0" ? "--webpack" : "--turbopack";
+  // Turbopack is the default on Node.js; on Bun or when explicitly disabled (=0),
+  // use Webpack (--webpack) to avoid Turbopack V8 internal worker API mismatches.
+  if (process.versions.bun || baseEnv.OMNIROUTE_USE_TURBOPACK === "0") {
+    return "--webpack";
+  }
+  return "--turbopack";
 }
 
 /**