feat(pipeline): output_language pro Org durch die Pipeline reichen

- OUTPUT_LANGUAGE Konstante aus config.py entfernt (jetzt pro Org in
  organization_settings).
- Orchestrator laedt output_language einmal pro Refresh aus der Org-Sprache.
- researcher.search(), analyzer.analyze/.analyze_incremental/.generate_latest_developments,
  factchecker.check/.check_incremental/.check_incremental_twophase bekommen
  output_language als Parameter (Default Deutsch).
- LANG_INTERNATIONAL / LANG_GERMAN_ONLY (+ Deep-Varianten) sind Funktionen,
  die je nach output_language die Sprachanweisung erzeugen (Deutsch | English
  | Fallback).
- Sprachfilter in researcher.search ist org-relativ: bei nicht-international
  werden Artikel mit Sprache != output_language_iso gefiltert.

Phase 2 von 8 (eng_demo / Org-Sprache). Bestandsorgs unveraendert, weil
Default-Setting weiterhin de (siehe Phase-1-Migration).

src/agents/factchecker.py

@@ -462,19 +462,18 @@ class FactCheckerAgent:
             lines.append(line)
         return "\n".join(lines)
 
-    async def check(self, title: str, articles: list[dict], incident_type: str = "adhoc") -> tuple[list[dict], ClaudeUsage | None]:
+    async def check(self, title: str, articles: list[dict], incident_type: str = "adhoc", output_language: str = "Deutsch") -> tuple[list[dict], ClaudeUsage | None]:
         """Führt vollständigen Faktencheck durch (erster Refresh)."""
         if not articles:
             return [], None
 
         articles_text = self._format_articles_text(articles)
 
-        from config import OUTPUT_LANGUAGE
         template = RESEARCH_FACTCHECK_PROMPT_TEMPLATE if incident_type == "research" else FACTCHECK_PROMPT_TEMPLATE
         prompt = template.format(
             title=title,
             articles_text=articles_text,
-            output_language=OUTPUT_LANGUAGE,
+            output_language=output_language,
         )
 
         try:
@@ -494,6 +493,7 @@ class FactCheckerAgent:
         new_articles: list[dict],
         existing_facts: list[dict],
         incident_type: str = "adhoc",
+        output_language: str = "Deutsch",
     ) -> tuple[list[dict], ClaudeUsage | None]:
         """Inkrementeller Faktencheck: Prüft nur neue Artikel gegen bestehende Fakten.
 
@@ -506,7 +506,6 @@ class FactCheckerAgent:
         articles_text = self._format_articles_text(new_articles, max_articles=15)
         existing_facts_text = self._format_existing_facts(existing_facts)
 
-        from config import OUTPUT_LANGUAGE
         if incident_type == "research":
             template = INCREMENTAL_RESEARCH_FACTCHECK_PROMPT_TEMPLATE
         else:
@@ -516,7 +515,7 @@ class FactCheckerAgent:
             title=title,
             articles_text=articles_text,
             existing_facts_text=existing_facts_text,
-            output_language=OUTPUT_LANGUAGE,
+            output_language=output_language,
         )
 
         try:
@@ -536,6 +535,7 @@ class FactCheckerAgent:
         new_articles: list[dict],
         existing_facts: list[dict],
         incident_type: str = "adhoc",
+        output_language: str = "Deutsch",
     ) -> tuple[list[dict], ClaudeUsage | None]:
         """Zwei-Phasen inkrementeller Faktencheck: Haiku-Triage + parallele Opus-Verifikation.
 
@@ -556,9 +556,9 @@ class FactCheckerAgent:
         triage_facts_text = self._format_facts_for_triage(existing_facts)
         articles_text = self._format_articles_text(new_articles, max_articles=15)
 
-        from config import OUTPUT_LANGUAGE, CLAUDE_MODEL_FAST
+        from config import CLAUDE_MODEL_FAST
         triage_prompt = TRIAGE_PROMPT_TEMPLATE.format(
-            output_language=OUTPUT_LANGUAGE,
+            output_language=output_language,
             fact_count=len(existing_facts),
             existing_facts_text=triage_facts_text,
             article_count=len(new_articles),
@@ -619,7 +619,7 @@ class FactCheckerAgent:
                 template = VERIFY_GROUP_PROMPT_TEMPLATE
 
             prompt = template.format(
-                output_language=OUTPUT_LANGUAGE,
+                output_language=output_language,
                 theme=theme,
                 facts_text=facts_text,
                 new_claims_text=new_claims_text,