feat: Add dedicated dashboard methods to service clients

Created typed, domain-specific methods in service clients instead of
using generic .get() calls with paths. This improves type safety,
discoverability, and maintainability.

Service Client Changes:
- ProcurementServiceClient:
  * get_pending_purchase_orders() - POs awaiting approval
  * get_critical_alerts() - Critical severity alerts
  * get_alerts_summary() - Alert counts by severity

- ProductionServiceClient:
  * get_todays_batches() - Today's production timeline
  * get_production_batches_by_status() - Filter by status

- InventoryServiceClient:
  * get_stock_status() - Dashboard stock metrics
  * get_sustainability_widget() - Sustainability data

Dashboard API Changes:
- Updated all endpoints to use new dedicated methods
- Cleaner, more maintainable code
- Better error handling and logging
- Fixed inventory data type handling (list vs dict)

Note: Alert endpoints return 404 - alert_processor service needs
endpoints: /alerts/summary and /alerts (filtered by severity).

shared/clients/production_client.py

@@ -445,6 +445,60 @@ class ProductionServiceClient(BaseServiceClient):
                        error=str(e), tenant_id=tenant_id)
             return None
 
+    # ================================================================
+    # DASHBOARD METHODS
+    # ================================================================
+
+    async def get_todays_batches(
+        self,
+        tenant_id: str
+    ) -> Optional[Dict[str, Any]]:
+        """
+        Get today's production batches for dashboard timeline
+
+        Args:
+            tenant_id: Tenant ID
+
+        Returns:
+            Dict with {"batches": [...], "summary": {...}}
+        """
+        try:
+            return await self.get(
+                "/production/production-batches/today",
+                tenant_id=tenant_id
+            )
+        except Exception as e:
+            logger.error("Error fetching today's batches", error=str(e), tenant_id=tenant_id)
+            return None
+
+    async def get_production_batches_by_status(
+        self,
+        tenant_id: str,
+        status: str,
+        limit: int = 100
+    ) -> Optional[Dict[str, Any]]:
+        """
+        Get production batches filtered by status for dashboard
+
+        Args:
+            tenant_id: Tenant ID
+            status: Batch status (e.g., "ON_HOLD", "IN_PROGRESS")
+            limit: Maximum number of batches to return
+
+        Returns:
+            Dict with {"items": [...], "total": n}
+        """
+        try:
+            return await self.get(
+                "/production/production-batches",
+                tenant_id=tenant_id,
+                params={"status": status, "limit": limit}
+            )
+        except Exception as e:
+            logger.error("Error fetching production batches", error=str(e),
+                       status=status, tenant_id=tenant_id)
+            return None
+
     # ================================================================
     # UTILITY METHODS
     # ================================================================