docs: add project documentation and work log

docs/prompt-log.md

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+# ASTRAIN Work Log
+
+Date: 2026-01-29
+
+## Summary
+- Created a .NET 10 solution with a Blazor WebAssembly client, ASP.NET Core minimal API backend, and shared models.
+- Implemented SQLite storage via EF Core and user ID creation/ensure flow (8-char alphanumeric key).
+- Added API endpoints for users, exercises, routines, and routine runs under `/api`.
+- Built a dark, mobile-first UI with bottom navigation, routines/exercises pages, and routine run view.
+- Added PWA assets (manifest, app icons) and splash/loading screen.
+- Added Dockerfile and docker-compose for single-container hosting and documentation.
+
+## Key Features Implemented
+- Routes: `/exercises`, `/{userId}/exercises`, `/routines`, `/{userId}/routines`.
+- User creation/redirect when missing.
+- Exercises: list/add/edit.
+- Routines: list/add/edit, start run, save run, last-run weight preload.
+- Run UI: checkboxes for completion, weight input with `kg` suffix, completed highlight.
+- UI: red/white theme, centered + buttons, nav refinement, top brand header.
+- PWA: `manifest.json`, icon/splash with `logo_square.png`.
+
+## Docker
+- Single container serves API at `/api` and the client at `/` (published WASM static files).
+
+## Files of Interest
+- Client: `src/ASTRAIN.Client`
+- API: `src/ASTRAIN.Api`
+- Shared: `src/ASTRAIN.Shared`
+- Docker: `src/ASTRAIN.Api/Dockerfile`, `docker-compose.yml`
+- PWA: `src/ASTRAIN.Client/wwwroot/manifest.json`