feat: add sweep.conf template and install it during setup

Add infrastructure/sweep.conf as a default config template with
COLD_ADDRESS, KEEP_SATS (300000), and MIN_SWEEP (50000). Update
setup.sh to copy this template to /opt/timmy-node/ during bootstrap
(preserving any existing config from lnd-init.sh).

Fixes #41

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

infrastructure/setup.sh

@@ -128,6 +128,11 @@ cp "$SCRIPT_DIR/docker-compose.yml" "$INFRA_DIR/docker-compose.yml"
 cp "$SCRIPT_DIR/lnd-init.sh" "$INFRA_DIR/lnd-init.sh"
 cp "$SCRIPT_DIR/sweep.sh" "$INFRA_DIR/sweep.sh"
 cp "$SCRIPT_DIR/ops.sh" "$INFRA_DIR/ops.sh"
+# Install default sweep config (lnd-init.sh will overwrite with user's cold address)
+if [[ ! -f "$INFRA_DIR/sweep.conf" ]]; then
+  cp "$SCRIPT_DIR/sweep.conf" "$INFRA_DIR/sweep.conf"
+  chmod 600 "$INFRA_DIR/sweep.conf"
+fi
 chmod +x "$INFRA_DIR/lnd-init.sh" "$INFRA_DIR/sweep.sh" "$INFRA_DIR/ops.sh"
 
 ok "Configs installed"

infrastructure/sweep.conf

@@ -0,0 +1,10 @@
+# Timmy Node — Auto-sweep configuration
+# Edit manually or run: bash ops.sh configure-sweep
+
+SWEEP_MODE="static"
+COLD_ADDRESS=""
+XPUB=""
+KEEP_SATS=300000
+MIN_SWEEP=50000
+SWEEP_CRON="0 3 * * *"
+SWEEP_FREQ_LABEL="daily at 3am UTC"