feat(sdk): AuthConfigs, JSON Schema, examples, and release checksum CI

Add craftlabs-auth-config.schema.json, Java AuthConfigs model with tests,
example configs aligned to BP-10, C/Java/auth-config documentation,
native header notes, RELEASING guide, and workflow to verify SDK
artifact checksums on release tags.

Made-with: Cursor

examples/config/school.bitanswer.json

@@ -0,0 +1,18 @@
+{
+  "schemaVersion": 1,
+  "provider": "bitanswer",
+  "scenario": "school",
+  "bitanswer": {
+    "url": "https://cloud.bitanswer.example/e3",
+    "loginMode": "AUTO",
+    "sn": ""
+  },
+  "features": {
+    "face": { "bitanswerFeatureId": 201 },
+    "expression": { "bitanswerFeatureId": 202 }
+  },
+  "school": {
+    "edgeDeviceId": "classroom-gate-01",
+    "tenantId": "school-district-demo"
+  }
+}