feat: rename rails/ to tools/ and add service tool suites

Rename the `rails/` directory to `tools/` for agent discoverability —
agents frequently failed to locate helper scripts due to the non-intuitive
directory name. Add backward-compat symlink `rails/ → tools/`.

New tool suites:
- Authentik: auth-token, user-list, user-create, group-list, app-list,
  flow-list, admin-status (8 scripts)
- Coolify: team-list, project-list, service-list, service-status, deploy,
  env-set (7 scripts)
- Woodpecker: pipeline-list, pipeline-status, pipeline-trigger (3 stubs)
- GLPI: session-init, computer-list, ticket-list, ticket-create, user-list
  (6 scripts)
- Health: stack-health.sh — stack-wide connectivity check

Infrastructure:
- Shared credential loader at tools/_lib/credentials.sh
- install.sh creates symlink + chmod on tool scripts
- All ~253 rails/ path references updated across 68+ files

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

tools/glpi/computer-list.sh

@@ -0,0 +1,59 @@
+#!/usr/bin/env bash
+#
+# computer-list.sh — List GLPI computers/assets
+#
+# Usage: computer-list.sh [-f format] [-l limit]
+#
+# Options:
+#   -f format   Output format: table (default), json
+#   -l limit    Number of results (default: 50)
+#   -h          Show this help
+set -euo pipefail
+
+MOSAIC_HOME="${MOSAIC_HOME:-$HOME/.config/mosaic}"
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$MOSAIC_HOME/tools/_lib/credentials.sh"
+load_credentials glpi
+
+FORMAT="table"
+LIMIT=50
+
+while getopts "f:l:h" opt; do
+  case $opt in
+    f) FORMAT="$OPTARG" ;;
+    l) LIMIT="$OPTARG" ;;
+    h) head -11 "$0" | grep "^#" | sed 's/^# \?//'; exit 0 ;;
+    *) echo "Usage: $0 [-f format] [-l limit]" >&2; exit 1 ;;
+  esac
+done
+
+SESSION_TOKEN=$("$SCRIPT_DIR/session-init.sh" -q)
+
+response=$(curl -sk -w "\n%{http_code}" \
+  -H "App-Token: $GLPI_APP_TOKEN" \
+  -H "Session-Token: $SESSION_TOKEN" \
+  "${GLPI_URL}/Computer?range=0-${LIMIT}")
+
+http_code=$(echo "$response" | tail -n1)
+body=$(echo "$response" | sed '$d')
+
+if [[ "$http_code" != "200" ]]; then
+  echo "Error: Failed to list computers (HTTP $http_code)" >&2
+  exit 1
+fi
+
+if [[ "$FORMAT" == "json" ]]; then
+  echo "$body" | jq '.'
+  exit 0
+fi
+
+echo "ID      NAME                          SERIAL              STATUS"
+echo "------  ----------------------------  ------------------  ----------"
+echo "$body" | jq -r '.[] | [
+  (.id | tostring),
+  .name,
+  (.serial // "—"),
+  (.states_id | tostring)
+] | @tsv' | while IFS=$'\t' read -r id name serial states_id; do
+  printf "%-6s  %-28s  %-18s  %s\n" "$id" "${name:0:28}" "${serial:0:18}" "$states_id"
+done