feat: migrate ORM base to sqlmodel-ext, add file viewers and WOPI integration

- Migrate SQLModel base classes, mixins, and database management to
  external sqlmodel-ext package; remove sqlmodels/base/, sqlmodels/mixin/,
  and sqlmodels/database.py
- Add file viewer/editor system with WOPI protocol support for
  collaborative editing (OnlyOffice, Collabora)
- Add enterprise edition license verification module (ee/)
- Add Dockerfile multi-stage build with Cython compilation support
- Add new dependencies: sqlmodel-ext, cryptography, whatthepatch

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Dockerfile

@@ -1,13 +1,52 @@
-FROM ghcr.io/astral-sh/uv:python3.13-bookworm-slim
+# ============================================================
+# 基础层：安装运行时依赖
+# ============================================================
+FROM ghcr.io/astral-sh/uv:python3.13-bookworm-slim AS base
 
 WORKDIR /app
 
 COPY pyproject.toml uv.lock ./
-
 RUN uv sync --frozen --no-dev
 
 COPY . .
 
-EXPOSE 5213
+# ============================================================
+# Community 版本：删除 ee/ 目录
+# ============================================================
+FROM base AS community
 
-CMD ["uv", "run", "fastapi", "run", "main.py", "--host", "0.0.0.0", "--port", "5213"]
+RUN rm -rf ee/
+COPY statics/ /app/statics/
+
+EXPOSE 5213
+CMD ["uv", "run", "fastapi", "run", "main.py", "--host", "0.0.0.0", "--port", "5213"]
+
+# ============================================================
+# Pro 编译层：Cython 编译 ee/ 模块
+# ============================================================
+FROM base AS pro-builder
+
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends gcc libc6-dev && \
+    rm -rf /var/lib/apt/lists/*
+
+RUN uv sync --frozen --no-dev --extra build
+
+RUN uv run python setup_cython.py build_ext --inplace && \
+    uv run python setup_cython.py clean_artifacts
+
+# ============================================================
+# Pro 版本：包含编译后的 ee/ 模块（仅 __init__.py + .so）
+# ============================================================
+FROM ghcr.io/astral-sh/uv:python3.13-bookworm-slim AS pro
+
+WORKDIR /app
+
+COPY pyproject.toml uv.lock ./
+RUN uv sync --frozen --no-dev
+
+COPY --from=pro-builder /app/ /app/
+COPY statics/ /app/statics/
+
+EXPOSE 5213
+CMD ["uv", "run", "fastapi", "run", "main.py", "--host", "0.0.0.0", "--port", "5213"]