feat: 添加后端架构、计算模块及部署文档

backend/app/modules/README.md

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+# Backend Module Convention
+
+每个业务模块建议保持一致结构：
+
+```text
+module_name/
+  __init__.py
+  router.py       # FastAPI router
+  schemas.py      # Pydantic request/response models
+  service.py      # Business orchestration
+  repository.py   # Database access
+  permissions.py  # Optional resource permission checks
+```
+
+模块边界以 `docs/system-development-plan.md` 的页面模块开发工作包为准。

backend/app/modules/approval/__init__.py

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+"""Approval workflow module."""

backend/app/modules/audit/__init__.py

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+"""Audit log module."""

backend/app/modules/auth/__init__.py

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+"""Authentication and user session module."""

backend/app/modules/compute_gateway/__init__.py

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+"""Application-side compute platform gateway module."""

backend/app/modules/data_process/__init__.py

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+"""Data processing module."""

backend/app/modules/dataset/__init__.py

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+"""Dataset management module."""

backend/app/modules/engine_registry/__init__.py

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+"""Training engine registry module."""

backend/app/modules/eval/__init__.py

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+"""Evaluation module."""

backend/app/modules/file_gateway/__init__.py

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+"""Application-side file gateway module."""

backend/app/modules/fine_tune/__init__.py

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+"""Fine-tuning task module."""

backend/app/modules/inference/__init__.py

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+"""Inference and compare module."""

backend/app/modules/model/__init__.py

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+"""Model registry module."""

backend/app/modules/project/__init__.py

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+"""Project workspace and member module."""

backend/app/modules/retention/__init__.py

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+"""Retention policy and cleanup module."""

backend/app/modules/system/__init__.py

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+"""System health, metrics and logs module."""

backend/app/modules/tenant/__init__.py

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+"""Tenant management module."""