feat(web-search): tool DuckDuckGo abierta en /web-search para watsonx Orchestrate

Sub-app FastAPI montada en /web-search con búsqueda vía ddgs.
OpenAPI 3.0.3 + servers absoluto + operationId webSearch listo para
importar como external tool en wxO. Sin auth (uso de taller/demo).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/web_search/config.py

@@ -0,0 +1,36 @@
+import os
+from functools import lru_cache
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class WebSearchSettings:
+    public_base_url: str
+    default_max_results: int
+    default_region: str
+    request_timeout: int
+
+
+def _int_env(name: str, default: int) -> int:
+    raw = os.environ.get(name)
+    if raw is None or raw == "":
+        return default
+    try:
+        return int(raw)
+    except ValueError:
+        return default
+
+
+@lru_cache
+def get_web_search_settings() -> WebSearchSettings:
+    base_url = os.environ.get("BASE_URL", "https://taller-wox.fitlabs.dev").rstrip("/")
+    public_base_url = os.environ.get(
+        "WEB_SEARCH_PUBLIC_BASE_URL",
+        f"{base_url}/web-search",
+    ).rstrip("/")
+    return WebSearchSettings(
+        public_base_url=public_base_url,
+        default_max_results=_int_env("WEB_SEARCH_DEFAULT_MAX_RESULTS", 5),
+        default_region=os.environ.get("WEB_SEARCH_DEFAULT_REGION", "wt-wt"),
+        request_timeout=_int_env("WEB_SEARCH_REQUEST_TIMEOUT", 12),
+    )