docs: add .claude-context project overview

.claude-context/00-overview.md

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+# Scratching Post
+
+Self-hosted digital signage / notice board, part of the Sunbeam framework. Deployed to IIS on Windows Server, with Docker as an alternative.
+
+**Repository:** https://gitea.hideawaygaming.com.au/jessikitty/ScratchingPost
+**Current version:** v1.1.1
+
+## Terminology
+- **Meow** — a slide
+- **PURR** — a device playlist
+- **Kitten** — a display node / device
+- **ASK** — planned priority-slide feature
+
+Always read live code for names — don't rely on memory (a past "Posts" rename was a mistake).
+
+## Architecture
+- ASP.NET Core 8 MVC, SQLite via EF Core `EnsureCreated()` (no migrations — new columns are added by a startup check)
+- TinyMCE, self-hosted, for WYSIWYG
+- `Infrastructure/Clock.cs` — all "now" comparisons go through `Clock.Now` (configured `TimeZone`; blank = host local)
+- Slide types: Content, Embed/iframe, ICS Calendar
+- Per-device playlists (SortableJS), per-device resolution scaling, URL routing per device (`/frontofhouse`)
+- Cookie auth for admin, credentials in `appsettings.json`
+
+## Ways of Working
+- Read live repo files before writing code
+- Minimal diffs; don't refactor working code
+- Stage changes and wait for Jess's go-ahead before pushing; commit by logical unit to `main`
+
+## Session Log
+- 2026-05-26 — Initial Build, Light Mode and Pasted-Table Formatting — v1.0 app; light default, white slides, Sheets table paste normalisation
+- 2026-08-23 — Docker Support, Meow Expiry and Time-Zone-Aware Clock — v1.1.0/v1.1.1: Docker, ExpiresAt with server-side filtering, Clock helper and TimeZone setting
+
+---
+*Created by: Jess Rogerson (yelling commands at Claude.AI)*