fix: dashboard-api service connectivity (Light-Heart-Labs#33)

Fix dashboard showing services as offline when containers are healthy.

Root cause: dashboard-api container was using URL-style env vars
(OLLAMA_URL) but manifests expect HOST-style (OLLAMA_HOST). Without
the correct env vars, health checks fell back to localhost which
doesn't work inside containers.

Changes:
- docker-compose.base.yml: Set explicit _HOST env vars for all core
  services so dashboard-api can resolve them via Docker DNS
- config.py: Add debug logging to show which services are loaded

Fixes Light-Heart-Labs#33

Author: Android-16

dream-server/docker-compose.base.yml

@@ -132,10 +132,16 @@ services:
       - DREAM_INSTALL_DIR=/dream-server
       - DREAM_DATA_DIR=/data
       - GPU_BACKEND=${GPU_BACKEND:-nvidia}
-      - OLLAMA_URL=${LLM_API_URL:-http://llama-server:8080}
+      - OLLAMA_HOST=llama-server
+      - WEBUI_HOST=open-webui
+      - N8N_HOST=n8n
+      - QDRANT_HOST=qdrant
+      - SEARXNG_HOST=searxng
+      - EMBEDDINGS_HOST=embeddings
+      - TTS_HOST=tts
+      - WHISPER_HOST=whisper
+      - DASHBOARD_HOST=dashboard
       - LLM_MODEL=${LLM_MODEL:-qwen3:30b-a3b}
-      - KOKORO_URL=${KOKORO_URL:-http://tts:8880}
-      - N8N_URL=${N8N_URL:-http://n8n:5678}
       - DASHBOARD_API_KEY=${DASHBOARD_API_KEY:-}
       - OPENCLAW_TOKEN=${OPENCLAW_TOKEN:-}
     volumes:

dream-server/extensions/services/dashboard-api/config.py

@@ -109,6 +109,10 @@ def load_extension_manifests(manifest_dir: Path, gpu_backend: str) -> tuple[dict
             logger.warning("Failed loading manifest %s: %s", path, e)
 
     logger.info("Loaded %d extension manifests (%d services, %d features)", loaded, len(services), len(features))
+    if services:
+        logger.info("Services loaded: %s", ", ".join(services.keys()))
+    else:
+        logger.error("No services loaded from manifests in %s — dashboard will have no services", manifest_dir)
     return services, features