feat: Add Raspberry Pi webcam capture and upload demo with install/uninstall scripts, config, and README.

demo/picupper.conf.example

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+# PicUpper Configuration
+# Copy this file to picupper.conf and update with your settings
+
+# ==============================================================================
+# SERVER SETTINGS
+# ==============================================================================
+
+# API endpoint URL
+API_URL="https://dev.seedheads.de/picUploadApi/upload"
+
+# Your API key (get this from the PicUpper server admin)
+API_KEY="your-api-key-here"
+
+# ==============================================================================
+# CAMERA SETTINGS
+# ==============================================================================
+
+# Unique identifier for this camera (no spaces, use hyphens)
+CAMERA_ID="rpi-webcam-1"
+
+# Video device path (run 'ls /dev/video*' to find yours)
+VIDEO_DEVICE="/dev/video0"
+
+# Capture resolution (common options: 1920x1080, 1280x720, 640x480)
+RESOLUTION="1920x1080"
+
+# Skip first N frames (helps camera adjust exposure, default 5)
+SKIP_FRAMES=5
+
+# ==============================================================================
+# ADVANCED SETTINGS (usually don't need to change)
+# ==============================================================================
+
+# Temporary file location
+TEMP_DIR="/tmp"
+
+# Log file location
+LOG_FILE="/var/log/picupper.log"
+
+# Connection timeout in seconds
+TIMEOUT=30
+
+# Retry failed uploads (0 = no retry)
+MAX_RETRIES=3
+
+# Delay between retries in seconds
+RETRY_DELAY=5