feat: add infrastructure documentation and processing pipeline for document scanner

- Introduced a comprehensive Docker image architecture for the project, detailing multi-stage builds for Rust backend and Next.js frontend.
- Added Docker Compose configuration for the tools service, including environment variables and volume management.
- Documented CI/CD integration steps for Docker build and deployment workflows.
- Implemented a detailed processing pipeline for document scanning, covering stages from image preprocessing to PDF generation.
- Included edge case handling and performance budget for each stage of the pipeline.
- Enhanced security considerations and rollback strategies for the tools service.

docs/plan/tools/README.md

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+# Tools — Document Scanner & Media Processing Hub
+
+Self-hosted, no-install document scanner dan media processing tools yang jalan di browser. Alternatif dari CamScanner, ilovepdf, compressjpeg — tanpa upload ke pihak ketiga.
+
+## Visi
+
+Satu platform dengan tools manipulasi file yang **beneran dipake orang setiap hari**. Semua proses di backend Rust — cepat, hemat memory, ga perlu install software.
+
+## Fitur Utama
+
+### Phase 1 — Document Scanner (Prioritas)
+- Foto dokumen pake HP → auto-detect tepi → lurusin (perspective correction)
+- Enhance: iluminasi merata, contrast, sharpen, B&W
+- OCR → searchable PDF (teks bisa di-copy, dicari)
+- Batch: multi-page → satu PDF
+- Fallback crop manual (kalau auto-detect gagal)
+
+### Phase 2 — Image Tools
+- Compress JPEG/PNG/WebP (lossy + lossless, atur kualitas %)
+- Resize batch (atur dimensi, semua foto disamain)
+- Convert format (HEIC→JPEG, PNG→WebP, SVG→PNG)
+- Remove background (ONNX model, Rust runtime)
+
+### Phase 3 — PDF Tools
+- Merge PDF (gabung file)
+- Split PDF (ekstrak halaman tertentu)
+- Images→PDF (kumpulan foto jadi 1 file)
+- PDF→Images (tiap halaman jadi gambar)
+- PDF compress (turunkin kualitas embedded images)
+
+### Phase 4 — Video/Audio Tools
+- Compress video (bitrate + resolusi)
+- Extract audio (MP4→MP3)
+- Trim/crop
+- GIF maker
+- Audio convert + trim
+
+## Target User
+
+Orang yang:
+- Punya HP/PC, paham teknologi dasar (buka browser, upload file)
+- Butuh scan dokumen tanpa install aplikasi
+- Butuh kompres file buat kirim WA/email
+- Butuh manipulasi PDF sesekali
+- Peduli privasi — ga mau upload file ke server pihak ketiga
+
+## Prinsip Desain
+
+1. **Satu task selesai dalam <5 detik** — ga ada loading lama
+2. **Drag & drop + preview** — liat hasil sebelum download
+3. **Progress realtime** via WebSocket — tau lagi di tahap mana
+4. **Batch processing** — banyak file, satu klik
+5. **Privasi first** — file otomatis dihapus setelah 1 jam
+6. **WASM fallback** — tools ringan jalan di client (tanpa upload)
+
+## Domain & Branding
+
+- **Domain**: `tools.asepharyana.my.id` | `tools.asepharyana.web.id`
+- **Design**: Twilight Terminal theme (sama kaya portfolio), konsisten visual
+- **Dashboard**: Link dari hub dashboard → tools stats (total files processed, storage used)