feat(03-06): add Databricks, Snowflake, Oracle GenAI, HPE GreenLake Tier 9 providers

- Databricks dapi-prefixed high-confidence regex pattern
- Snowflake/Oracle/HPE keyword-only detection
- Completes PROV-09 (8 Tier 9 enterprise providers)

pkg/providers/definitions/databricks.yaml

@@ -0,0 +1,23 @@
+format_version: 1
+name: databricks
+display_name: Databricks (DBRX / Mosaic)
+tier: 9
+last_verified: "2026-04-05"
+keywords:
+  - "databricks"
+  - "DATABRICKS_TOKEN"
+  - "DATABRICKS_HOST"
+  - "dbrx"
+  - "mosaicml"
+  - "dapi"
+  - ".cloud.databricks.com"
+patterns:
+  - regex: 'dapi[a-f0-9]{32}(-[0-9]{1,2})?'
+    entropy_min: 3.5
+    confidence: high
+verify:
+  method: GET
+  url: ""
+  headers: {}
+  valid_status: []
+  invalid_status: []