feat(project): 朝向作为唯一方向规格

[xiaocheny214]

Summary

• 关闭 proposal: 合并重复且冲突的游戏视角与朝向字段 #664 的后端部分：directional_movement（朝向）成为唯一可写入的项目方向规格；character_perspective 不再落库，生成约束只从朝向派生（单向→横版侧视、四向→俯视、八向→2.5D）。
• 目标表结构只在 ORM 里定义。不引入 SQL 迁移框架：create_all 管新表，schema_sync 管加列；删列属于会丢数据的操作，按 feat(ops): 加一个只做加法的表结构巡检 #616 只报告、不自动做。旧库多留一列不影响读写。
• 创建请求不再要求 character_perspective（旧客户端多传会被忽略）。响应里仍派生该字段（readOnly），方便前端过渡。

本 PR 不改前端。前端同学按 OpenAPI：创建只发 directional_movement；列表/详情暂时仍可读派生的 character_perspective。

Close #664

Test plan

• uv run pytest：项目创建忽略旧字段、朝向约束 facing、schema_sync 存量插入
• 空库启动：windup_project 无 character_perspective
• 已有库启动：应用可读写；该列可仍在库里，查询不再点名它
• POST /projects 不传 character_perspective 可创建；同时传 character_perspective=1 + directional_movement=3 时只认朝向，响应里 character_perspective == 3
• 四向项目生成 facing=front，单向项目 facing=side

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
windup	Ignored	Preview	Aug 27, 2026 7:19am

[github-actions]

✅ 此 PR 已关联 issue，之前的提醒已自动标记为已解决。

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #676      +/-   ##
==========================================
- Coverage   86.52%   86.52%   -0.01%     
==========================================
  Files         293      293              
  Lines       21902    21904       +2     
  Branches     3329     3329              
==========================================
+ Hits        18951    18952       +1     
  Misses       2021     2021              
- Partials      930      931       +1     

Flag	Coverage Δ
backend	91.55% <100.00%> (+<0.01%)	⬆️
frontend	80.52% <ø> (-0.02%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...app/src/windup_app/server/orchestrator/executor.py	78.56% <100.00%> (+0.03%)	⬆️
...ackages/app/src/windup_app/server/project/model.py	100.00% <ø> (ø)
...end/packages/app/src/windup_app/web/api/project.py	89.57% <100.00%> (+0.12%)	⬆️
...kages/common/src/windup_common/models/character.py	96.96% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[fennoai]

已审阅固定范围 25b54f87b1c185e84564d2b14cd42562a4084942...b827349fe68f3fe507dad68d403a2ff1171680f7 的完整变更，重点核对了项目 DTO/响应兼容、朝向约束读取、API/worker 启动建表与 SQL 迁移的幂等及并发路径。未发现满足报告阈值的可确认正确性、回归或安全问题。

静态验证通过：python3 -m compileall（变更后的 Python 源文件）与 git diff --check。未能运行 pytest：当前环境没有 uv 或已安装的 pytest。

[vercel]

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[xiaocheny214]

已按「目标结构只在 ORM 定义一次」收掉本 PR 原先的 SQL 迁移框架（migrate.py / backend/migrations/ / 启动时跑版本化 SQL）。

当前业务不需要那一套：character_perspective 是重复规格，不是要把旧值搬到新列。从模型删掉之后 SQLAlchemy 不再读它，旧库多留一列也能跑。create_all 继续只建缺表，加列走已有的 schema_sync，删列仍按 #616 人工处理。

分支已 rebase 到最新 main，冲突应已消除。