feat: add native Windows local orchestration

docs/LOCAL-DEVELOPMENT.md

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+# Local development without Docker Compose
+
+This Windows-only helper runs the API, analytics worker, and frontend directly from the three sibling repositories. PostgreSQL and Redis must already be reachable locally. It does not create databases, run migrations/imports, generate credentials, edit service-owned environment files, or start Docker.
+
+## Prerequisites
+
+- Go and npm are on `PATH`.
+- PostgreSQL is reachable at `127.0.0.1:5432`.
+- Redis is reachable at `127.0.0.1:6379`.
+- The backend has `cmd/api` and `cmd/worker`, plus a protected backend-owned `.env`.
+- The frontend has a `package.json` `dev` script and its frontend-owned local environment file.
+- Dependencies, migrations, the one-time importer, and demo merchant creation have already completed through their owning repositories.
+
+The helper only reports variable names or file paths when validation fails. It never prints resolved environment values. Runtime process metadata and logs are written under ignored `.local/`.
+
+## Commands
+
+Run these from the deployment repository in PowerShell:
+
+```powershell
+.\scripts\local-dev.ps1 check
+.\scripts\local-dev.ps1 start
+.\scripts\local-dev.ps1 status
+.\scripts\local-dev.ps1 stop
+```
+
+The default sibling locations are `../zarinpal-analytics-backend` and `../zarinpal-analytics-frontend`. Override them with `-BackendPath` and `-FrontendPath` when necessary.
+
+`stop` terminates only the process trees whose PID and start time match the ignored state file. A stale or reused PID is not terminated.
+
+## Verification
+
+```powershell
+pwsh -NoProfile -File .\tests\local-dev.tests.ps1
+pwsh -NoProfile -File .\scripts\local-dev.ps1 check
+```
+
+After `start`, open the frontend URL declared by the frontend development server. Inspect `.local/logs/*.err.log` if a process exits during or after startup.