docs: add backend v1.31.0 changelog

changelog/backend.mdx

@@ -1,13 +1,55 @@
 ---
 title: "Backend"
-sidebarTitle: "Backend [1.30.0]"
+sidebarTitle: "Backend [1.31.0]"
 rss: true
 ---
 
 <Card title="Schedule Call" href="https://www.paloaltonetworks.com/ai-security/ai-gateway#:~:text=See%20Prisma%20AIRS%20AI%20Gateway%20in%20Action" icon="calendar" horizontal>
 Discuss how Portkey's AI Gateway can enhance your organization's AI infrastructure
 </Card>
 
+<Update label="1.31.0" description="2026-11-05">
+
+## v1.31.0
+---
+
+### JWT & Authentication
+- **`jwt_settings` enforcement**: Control-plane JWT authentication now applies an organisation's `jwt_settings` (algorithms, `aud`, `iss`, clock tolerance, required claims, claim values, extracted claims), matching the gateway. ES, PS and RS algorithms and non-RSA JWKs are accepted. `algorithms` is limited to asymmetric algorithms (plus EdDSA), and `claim_values` regexes are validated when saved
+- **Start hooks**: Organisation-level `start_hooks` apply to JWT-authenticated requests
+- **Workspace name**: JWT-authenticated requests include the workspace name in the workspace details
+  - [Documentation](/product/enterprise-offering/org-management/jwt)
+
+### Guardrails
+- **Bedrock `failOnError`**: Set `failOnError` on the Bedrock guardrail to fail the check when the Bedrock request errors or times out. Default is `false`
+  - [Documentation](/integrations/guardrails/bedrock-guardrails)
+- **Detail summary target**: The guardrail detail summary APIs return the actual hook target (`input` or `output` type) instead of always reporting the LLM target
+  - [Documentation](/product/guardrails)
+
+### Organisation Admin API
+- **New scopes**: `organisation_auth`, `organisation_security` and `organisation_enforcements` (each with `read` and `update`) can be granted to organisation service API keys and are available to owners and admins
+  - [Documentation](/product/enterprise-offering/org-management/api-keys-authn-and-authz)
+
+### Providers
+- **Bedrock**: Bedrock integrations accept `bedrock_map_metadata` (boolean, default `false`)
+  - [Documentation](/integrations/llms/bedrock/aws-bedrock)
+
+### Configs
+- **`auto_caching`**: The config schema accepts the `auto_caching` boolean
+  - [Documentation](/product/ai-gateway/configs)
+
+### Fixes and Improvements
+- **Integrations**: Creating an integration with null custom headers no longer fails
+  - [Documentation](/integrations/llms)
+- **Access policies**: Writes that land while an access policy bundle is building now trigger a rebuild instead of being lost
+  - [Documentation](/product/enterprise-offering/access-control-management)
+- **API keys**: Fixed an unhandled exception when fetching API key details
+  - [Documentation](/product/enterprise-offering/org-management/api-keys-authn-and-authz)
+- **Configs**: Config fetches read only the latest version instead of joining all versions, and an index on `config_versions` speeds version listing
+  - [Documentation](/product/ai-gateway/configs)
+- Updated dependencies to patch security vulnerabilities.
+
+</Update>
+
 <Update label="1.30.0" description="2026-10-27">
 
 ## v1.30.0