refactor: move hermes files into ai/hermes/ subdirectory

- ai/Dockerfile -> ai/hermes/Dockerfile
- ai/fix-permissions.sh -> ai/hermes/fix-permissions.sh
- ai/patch_tts_tool.py -> ai/hermes/patch_tts_tool.py
- ai/compose.yml: update hermes build context to ./hermes
- ollama stays at ai/ollama/Dockerfile

ai/hermes/fix-permissions.sh

@@ -0,0 +1,38 @@
+#!/bin/bash
+# Startup permission fix + TTS patch.
+# Runs as root before the entrypoint drops to the hermes user.
+set -e
+
+HERMES_HOME="${HERMES_HOME:-/opt/data}"
+
+# Fix ownership on critical writable directories
+chown -R hermes:hermes \
+  "$HERMES_HOME/sessions" \
+  "$HERMES_HOME/checkpoints" \
+  "$HERMES_HOME/skills" \
+  "$HERMES_HOME/memories" \
+  "$HERMES_HOME/workspace" \
+  "$HERMES_HOME/pastes" \
+  "$HERMES_HOME/logs" \
+  "$HERMES_HOME/cron" \
+  "$HERMES_HOME/plans" \
+  "$HERMES_HOME/hooks" \
+  "$HERMES_HOME/cache" \
+  2>/dev/null || true
+
+# Fix data volume root ownership
+if [ "$(stat -c %u "$HERMES_HOME" 2>/dev/null)" != "$(id -u hermes)" ]; then
+  chown hermes:hermes "$HERMES_HOME" 2>/dev/null || true
+fi
+
+# ---------- Patch tts_tool.py: replace Edge TTS with Piper ----------
+# Fallback runtime patch in case the volume's site-packages differ from the image.
+# Idempotent: if already patched, the script does nothing.
+PATCH_SCRIPT="/opt/hermes/patch_tts_tool.py"
+if [ -f "$PATCH_SCRIPT" ]; then
+  echo "Applying TTS patch (Piper only, no Edge fallback)..."
+  /opt/hermes/.venv/bin/python3 "$PATCH_SCRIPT" 2>&1 || true
+fi
+
+# Chain to the official Hermes entrypoint
+exec /opt/hermes/docker/entrypoint.sh "$@"