feat(03-06): add Salesforce, ServiceNow, SAP, Palantir Tier 9 providers

- Keyword-only detection; strong env var anchors
- Dual-located in providers/ and pkg/providers/definitions/

pkg/providers/definitions/sap-ai-core.yaml

@@ -0,0 +1,19 @@
+format_version: 1
+name: sap-ai-core
+display_name: SAP AI Core / Joule
+tier: 9
+last_verified: "2026-04-05"
+keywords:
+  - "sap-ai-core"
+  - "sap-joule"
+  - "SAP_AICORE_CLIENT_ID"
+  - "SAP_AICORE_CLIENT_SECRET"
+  - "SAP_AICORE_AUTH_URL"
+  - "hana.ondemand.com"
+  - "aicore"
+verify:
+  method: GET
+  url: ""
+  headers: {}
+  valid_status: []
+  invalid_status: []