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/sizing/cpu-conversion-ratios.yaml

@@ -65,8 +65,8 @@ adb_s_sizing:
 memory_sizing:
   oci_shapes:
     standard_e4: "16 GB per OCPU (VM.Standard.E4.Flex)"
-    standard_e5: "16 GB per OCPU (VM.Standard.E5.Flex)"
+    standard_e5: "up to 64 GB per OCPU (VM.Standard.E5.Flex, default 16)"
     standard_a1: "6 GB per OCPU (VM.Standard.A1.Flex / Ampere)"
-    standard_a2: "8 GB per OCPU (VM.Standard.A2.Flex / Ampere)"
+    standard_a2: "up to 64 GB per OCPU (VM.Standard.A2.Flex / Ampere)"
     optimized3: "14 GB per OCPU (VM.Optimized3.Flex)"
     dense_io_e4: "32 GB per OCPU + local NVMe (VM.DenseIO.E4.Flex)"