Restructure repository: organize blueprints into folders

Each blueprint now has its own folder containing:
- blueprint.yaml: The automation code with a short header
- README.md: Detailed documentation extracted from headers

Updated CLAUDE.md with repository structure guidelines.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Zigbee/MQTT Light Selector/README.md

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+# MQTT Light Selector Blueprint
+
+Cycles through a list of lights using MQTT button events (up/down/remind). The selected light flashes to provide visual feedback, then returns to its original state. Selection is persisted in an input_text helper.
+
+## Features
+
+- Navigate lights with up/down actions
+- Remind action flashes the currently selected light
+- Visual feedback via configurable flash pattern
+- Persists selection in an input_text helper
+- Optional state persistence across restarts (JSON storage)
+- Optional "remind on idle" - up/down acts as remind if idle too long
+
+## How It Works
+
+1. Press up/down to cycle through the light list
+2. Selected light flashes N times to confirm selection
+3. Light returns to its original on/off state after flashing
+
+## Author
+
+Alexei Dolgolyov (dolgolyov.alexei@gmail.com)