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/git/issue-comment.sh

@@ -0,0 +1,61 @@
+#!/bin/bash
+# issue-comment.sh - Add a comment to an issue on GitHub or Gitea
+# Usage: issue-comment.sh -i <issue_number> -c <comment>
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/detect-platform.sh"
+
+# Parse arguments
+ISSUE_NUMBER=""
+COMMENT=""
+
+while [[ $# -gt 0 ]]; do
+    case $1 in
+        -i|--issue)
+            ISSUE_NUMBER="$2"
+            shift 2
+            ;;
+        -c|--comment)
+            COMMENT="$2"
+            shift 2
+            ;;
+        -h|--help)
+            echo "Usage: issue-comment.sh -i <issue_number> -c <comment>"
+            echo ""
+            echo "Options:"
+            echo "  -i, --issue    Issue number (required)"
+            echo "  -c, --comment  Comment text (required)"
+            echo "  -h, --help     Show this help"
+            exit 0
+            ;;
+        *)
+            echo "Unknown option: $1"
+            exit 1
+            ;;
+    esac
+done
+
+if [[ -z "$ISSUE_NUMBER" ]]; then
+    echo "Error: Issue number is required (-i)"
+    exit 1
+fi
+
+if [[ -z "$COMMENT" ]]; then
+    echo "Error: Comment is required (-c)"
+    exit 1
+fi
+
+detect_platform
+
+if [[ "$PLATFORM" == "github" ]]; then
+    gh issue comment "$ISSUE_NUMBER" --body "$COMMENT"
+    echo "Added comment to GitHub issue #$ISSUE_NUMBER"
+elif [[ "$PLATFORM" == "gitea" ]]; then
+    tea issue comment "$ISSUE_NUMBER" "$COMMENT"
+    echo "Added comment to Gitea issue #$ISSUE_NUMBER"
+else
+    echo "Error: Unknown platform"
+    exit 1
+fi