Fix 30 KB errors: ExaCS storage 3-10x wrong, ECPU transition, IOPS limits, missing shapes

Cross-referenced all 70+ KB files against official Oracle docs. Critical fixes:
- ExaCS: storage was flash cache not usable disk (76.8→190.8 TB QR), added X11M, removed X10M
- ADB-S: OCPU→ECPU migration, 26ai as default, cross-region RTO 15→10 min
- Compute: E5 max 94→126, A2 80→78, added E6/A4/BM shapes, 11 GPU shapes
- Storage: Higher Perf IOPS 35K→50K, UHP 450K→300K, File Storage 25K→50K
- DBCS: E5.Flex max 94→64, storage 80→150 TB, added 26ai
- Networking: FastConnect +400 Gbps, NSG max 120 rules

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

kb/services/dbcs.yaml

@@ -30,12 +30,14 @@ when_NOT_to_use:
 
 limits:
   vm_shapes:
-    - "VM.Standard.E5.Flex: 1-94 OCPUs"
+    - "VM.Standard.E5.Flex: 1-64 OCPUs"
     - "VM.Standard3.Flex: 1-32 OCPUs"
+    - "VM.Standard.x86: ECPU billing (new shape)"
   bm_shapes:
     - "BM.Standard.E5: 128 OCPUs"
     - "BM.DenseIO.E5: 128 OCPUs with NVMe"
-  max_storage_tb: 80  # block storage
+  max_storage_tb: 150  # block storage (Universal Credits)
+  supported_versions: ["19c", "21c", "23ai", "26ai"]
   rac_max_nodes: 2
 
 features: