refactor: Token-Tracking mit source=monitor fuer Split-Anzeige

token_usage_monthly hat jetzt UNIQUE(org_id, year_month, source).
Monitor schreibt mit source=monitor, Globe mit source=globe.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/agents/orchestrator.py

@@ -1321,10 +1321,10 @@ class AgentOrchestrator:
                 year_month = datetime.now(TIMEZONE).strftime('%Y-%m')
                 await db.execute("""
                     INSERT INTO token_usage_monthly
-                        (organization_id, year_month, input_tokens, output_tokens,
+                        (organization_id, year_month, source, input_tokens, output_tokens,
                          cache_creation_tokens, cache_read_tokens, total_cost_usd, api_calls, refresh_count)
-                    VALUES (?, ?, ?, ?, ?, ?, ?, ?, 1)
-                    ON CONFLICT(organization_id, year_month) DO UPDATE SET
+                    VALUES (?, ?, 'monitor', ?, ?, ?, ?, ?, ?, 1)
+                    ON CONFLICT(organization_id, year_month, source) DO UPDATE SET
                         input_tokens = input_tokens + excluded.input_tokens,
                         output_tokens = output_tokens + excluded.output_tokens,
                         cache_creation_tokens = cache_creation_tokens + excluded.cache_creation_tokens,