fix: vision(#623): disinto-chat container scaffold (no auth) (#705)

docker/chat/entrypoint-chat.sh

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# entrypoint-chat.sh — Start the disinto-chat backend server
+#
+# Exec-replace pattern: this script is the container entrypoint and runs
+# the server directly (no wrapper needed). Logs to stdout for docker logs.
+
+LOGFILE="/var/chat/chat.log"
+
+log() {
+    printf '[%s] %s\n' "$(date -u '+%Y-%m-%d %H:%M:%S UTC')" "$*" | tee -a "$LOGFILE"
+}
+
+# Verify Claude CLI is available (expected via volume mount from host).
+if ! command -v claude &>/dev/null; then
+    log "FATAL: claude CLI not found in PATH"
+    log "Mount the host binary into the container, e.g.:"
+    log "  volumes:"
+    log "    - /usr/local/bin/claude:/usr/local/bin/claude:ro"
+    exit 1
+fi
+log "Claude CLI: $(claude --version 2>&1 || true)"
+
+# Start the Python server (exec-replace so signals propagate correctly)
+log "Starting disinto-chat server on port 8080..."
+exec python3 /usr/local/bin/server.py