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>

bin/mosaic-quality-apply

@@ -9,7 +9,7 @@ usage() {
   cat <<USAGE
 Usage: $(basename "$0") --template <name> [--target <dir>]
 
-Apply Mosaic quality rails templates into a project.
+Apply Mosaic quality tools templates into a project.
 
 Templates:
   typescript-node
@@ -55,7 +55,7 @@ if [[ ! -d "$TARGET_DIR" ]]; then
   exit 1
 fi
 
-SCRIPT="$MOSAIC_HOME/rails/quality/scripts/install.sh"
+SCRIPT="$MOSAIC_HOME/tools/quality/scripts/install.sh"
 if [[ ! -x "$SCRIPT" ]]; then
   echo "[mosaic-quality] Missing install script: $SCRIPT" >&2
   exit 1