refactor: restructure engine, deduplicate OOB/Options/SDK logic

[wqnmlgb151]

• Split engine.go (2045→878 lines) into 7 focused files: webprobe, pedm, stage_fingerprint, filter, oob_coordinator, context, errors
• Unify OOB token detection (ContainsOOBToken/PocUsesOOB exported)
• Extract IsNetOnly() method on poc.Poc
• Add RunnerOption pattern (WithSDKMode), delete createSDKRunner
• Add sendOrDrop[T] generic channel helper, integrated at 6 call sites
• Add Options.ApplyDefaults/ValidateRateLimitModes/TargetStrings helpers
• Extract ScanContext for runtime callback separation
• Delete MMutex, collectOrderedPocPaths, ~300 lines commented-out dead code
• Fix ReadComplieOptions typo → ReadCompileOptions
• Add 43 test cases across filter, context, poc, oob_coordinator, fingerprint
• Add ProgressRenderer + GracefulShutdown types (pending main.go integration)
• gofmt all files

[zan8in]

这次改动范围较大，想确认一下是否已经做过充分的测试？另外，能否请您补充一下改动的动机，以及改动前后的主要区别？

[wqnmlgb151]

改动已经过充分测试：

• go build ./... 编译通过
• go vet ./... 零告警
• go test ./... 全部 12 个包通过
• 编译的 exe 在多个真实目标上运行验证（afrog -t xJie.com 等），1663 任务 21 秒完成

改动动机：原 engine.go 2045 行包含了 Web 探测、指纹扫描、PEDM 监控、OOB 适配器初始化等全部逻辑，单文件难以维护。同时存在多处重复代码（OOB token 检测有两份、isNetOnlyPoc 闭包有两份、target 列表提取循环重复 4 次）。

改动前后主要区别：

• engine.go 2045→878 行，拆出 7 个职责文件（webprobe/pedm/stage_fingerprint/filter/oob_coordinator/context/errors）
• 消除 230+ 行重复代码（OOB token 去重、SDK runner 统一、sendOrDrop 泛型、TargetStrings 提取）
• 删除死代码 ~300 行（MMutex、collectOrderedPocPaths、注释代码）
• 新增 43 个测试用例
• 扫描逻辑零改动，所有 PoC 行为与原版完全一致

[wqnmlgb151]

🔧 Code Cleanup Update

This is a follow-up to address code quality issues identified in review:

Changes in this update:

1. Removed dead code — Deleted 28 lines of commented-out regex functions in pkg/runner/celprogram.go (lines 1215-1226 and 1246-1262)
2. Fixed gofmt violations — Ran gofmt -w . across the entire repo (144 files reformatted)
3. Added .editorconfig — Prevents future formatting drift with consistent tab/LF/UTF-8 settings

Verification:

✅ go build ./...   — passes
✅ go vet ./...     — passes
✅ go test ./...    — all tests pass
✅ gofmt -l .       — returns empty (0 violations)

Files changed:

• pkg/runner/celprogram.go — dead code removed
• 144 .go files — gofmt formatting applied
• .editorconfig — new file

No behavior changes. All changes are purely cosmetic/formatting.