feat: migrate toolchain to Vite+

[fengmk2]

Migrates the monorepo from split tooling (Vite 7, Vitest, Oxlint, Oxfmt) to Vite+ 0.2.7 via vp migrate.

• Bump apps/web to Vite 8.2.0, resolved through the new pnpm catalog to the Rolldown-powered @voidzero-dev/vite-plus-core build, Vitest pinned at 4.1.10
• Consolidate .oxlintrc.json into the new root vite.config.ts, now the single config for lint/fmt/test
• Rewrite vitest imports to vite-plus/test in 56 files, switch package scripts to vp lint / vp fmt / vp test run
• Reformat 319 files with the bundled Oxfmt 0.62, which now also formats Markdown (most of the diff is openspec/ and wiki/ docs)
• Replace husky with vp-managed hooks (.vite-hooks via vp config); the gitleaks fail-closed pre-commit and pre-push scans are preserved, and pre-commit also runs vp staged (vp check --fix on staged files)

Type-aware linting stays off in the root config for now: it reports 88 pre-existing findings (58 no-floating-promises, plus unbound-method, no-base-to-string, one real type error in scripts/migrate-mongo-to-pg.ts) and its suggested tsconfig rootDir fix would break the apps/api build, which compiles workspace packages via tsconfig paths. Planned as a follow-up.

Verified: vp check clean (750 files formatted, 268 lint-clean), 232 tests pass, all builds pass, typecheck clean, openspec validate --all --strict 62/62.

[thonatos]

Review: 工具链迁移本身合理，注意两点

实质改动：husky→.vite-hooks（vp config 接管）、oxlint/oxfmt→vp lint/fmt、vitest→vp test、lint 配置并入 vite.config.ts、vite/vitest catalog + peerDependencyRules、pre-commit 保留 gitleaks 暂存扫描。方向正确。

注意

1. 首个提交 migrate toolchain to Vite+ 顺带全仓 vp fmt（383 文件 / 1.3 万行，admin.ts 的 1189 行变更均为换行重排，含 wiki 与 .agents/skills 的 md）。格式化基线已固化进下游 #3–#7 每个堆叠 PR，噪声与冲突面大，建议在 PR 描述中明确。
2. prepare: vp config 会在 Docker 构建的 pnpm install 中执行，而镜像内无 .git。镜像构建工作流仅在 push main 时运行、尚未被此 PR 验证，合并前请确认 vp config 在无 git 环境能优雅跳过，避免构建失败。