Add READMEs for AUR CLI and API packages

- aur-cli: Lightweight CLI-only usage documentation
- aur-api: REST API with HTTPS/TLS configuration docs
- aur: Updated to reflect Python 3.11-3.14 support

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

aur-api/README.md

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+# Stegasoo API AUR Package
+
+REST API server package for programmatic steganography operations. Includes HTTPS support and API key authentication.
+
+## Installation
+
+### From AUR (once published)
+```bash
+yay -S stegasoo-api-git
+# or
+paru -S stegasoo-api-git
+```
+
+### Manual build
+```bash
+git clone https://aur.archlinux.org/stegasoo-api-git.git
+cd stegasoo-api-git
+makepkg -si
+```
+
+## What Gets Installed
+
+- `/opt/stegasoo-api/venv/` - Self-contained Python venv with API dependencies
+- `/opt/stegasoo-api/config/` - API key storage
+- `/opt/stegasoo-api/certs/` - TLS certificates
+- `/usr/bin/stegasoo` - CLI executable
+- `/usr/lib/systemd/system/stegasoo-api.service` - Systemd service
+
+## Quick Start
+
+```bash
+# 1. Create an API key
+sudo -u stegasoo stegasoo api keys create mykey
+
+# 2. Start the service
+sudo systemctl enable --now stegasoo-api
+
+# 3. Test the API
+curl -k -H "X-API-Key: YOUR_KEY" https://localhost:8000/
+```
+
+## Service Details
+
+| Setting | Value |
+|---------|-------|
+| Port | 8000 |
+| Protocol | HTTPS (self-signed cert auto-generated) |
+| API Docs | https://localhost:8000/docs |
+| OpenAPI | https://localhost:8000/openapi.json |
+
+## API Key Management
+
+```bash
+# List all keys
+stegasoo api keys list
+
+# Create a new key
+sudo -u stegasoo stegasoo api keys create <name>
+
+# Revoke a key
+sudo -u stegasoo stegasoo api keys revoke <name>
+```
+
+## TLS Configuration
+
+```bash
+# View current certificate info
+stegasoo api tls info
+
+# Generate new self-signed certificate
+sudo -u stegasoo stegasoo api tls generate
+
+# Use custom certificates (edit service)
+sudo systemctl edit stegasoo-api
+# Add:
+# [Service]
+# ExecStart=
+# ExecStart=/opt/stegasoo-api/venv/bin/stegasoo api serve \
+#     --host 0.0.0.0 --port 8000 \
+#     --cert /path/to/cert.pem --key /path/to/key.pem
+```
+
+## Manual Run (without systemd)
+
+```bash
+# Development mode (auto-reload)
+/opt/stegasoo-api/venv/bin/stegasoo api serve --reload
+
+# Production mode
+/opt/stegasoo-api/venv/bin/stegasoo api serve --host 0.0.0.0 --port 8000
+```
+
+## For Web UI
+
+Install the full package instead:
+```bash
+yay -S stegasoo-git
+```
+
+## Maintainer
+
+Aaron D. Lee