Move restic repo path to .env and derive paths from script dir

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

_backup/backup.sh

@@ -1,19 +1,18 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-STACKS_DIR="$HOME/stacks"
+SCRIPT_DIR="$(cd "$(dirname "$0")" && pwd)"
+STACKS_DIR="$(dirname "$SCRIPT_DIR")"
 DATA_DIR="$STACKS_DIR/.data"
 DUMP_DIR="$DATA_DIR/backup/dumps"
-REPO="/mnt/hidrive/users/valknar/Backup/stacks"
-LOG_FILE="$STACKS_DIR/_backup/backup.log"
+LOG_FILE="$SCRIPT_DIR/backup.log"
 
 # Load environment
 set -a
-source "$STACKS_DIR/_backup/.env"
+source "$SCRIPT_DIR/.env"
 set +a
 
-export RESTIC_REPOSITORY="$REPO"
-export RESTIC_PASSWORD
+export RESTIC_REPOSITORY RESTIC_PASSWORD
 
 log() { echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" | tee -a "$LOG_FILE"; }