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/salesforce-einstein.yaml

@@ -0,0 +1,19 @@
+format_version: 1
+name: salesforce-einstein
+display_name: Salesforce Einstein GPT
+tier: 9
+last_verified: "2026-04-05"
+keywords:
+  - "einstein-gpt"
+  - "einsteinGPT"
+  - "SALESFORCE_CONSUMER_KEY"
+  - "SALESFORCE_CONSUMER_SECRET"
+  - "api.salesforce.com"
+  - "einstein.ai"
+  - "salesforce-einstein"
+verify:
+  method: GET
+  url: ""
+  headers: {}
+  valid_status: []
+  invalid_status: []