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/patterns/database-ha-adb-s.yaml

@@ -28,7 +28,7 @@ variants:
     name: "Same-Region Autonomous Data Guard Standby"
     topology: "Primary + Standby in same region via Autonomous Data Guard"
     rpo: "0 (synchronous replication)"
-    rto: "< 30 seconds (automatic switchover)"
+    rto: "~2 minutes (automatic switchover)"
     use_when:
       - "Zero RPO mandatory"
       - "Protection against full AD or FD failure"