chore: initialize repository baseline

Import the existing Electron + React + TypeScript app as the version-control
baseline before the scanner rework (C# input/capture sidecar, resolution-anchored
layout profiles, OCR preprocessing, eval harness, rescan-merge, GOOD interop).

Housekeeping in this commit:
- Remove orphaned temp_inputhelper_block.ts (duplicate of the input-helper script).
- Ignore .claude/scheduled_tasks.lock local session state.
- Add .gitattributes to normalize line endings (LF in repo).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

docs/repository-setup.md

@@ -0,0 +1,29 @@
+# Repository Setup
+
+## Install
+
+```powershell
+npm install
+```
+
+## Development
+
+```powershell
+npm run dev
+```
+
+Use the Electron window for scanner work. Browser preview does not expose the capture bridge.
+
+## Validation
+
+```powershell
+npm run lint
+npm test
+npm run build
+```
+
+## Notes
+
+- Genshin should be visible on the primary display for the current Smart Capture path.
+- The app is Windows-first.
+- Scanner OCR is still prototype-grade.