Enterprise v1.5.1 base release

What's Changed

• feat: add circuitBreakerConfig (policies[]) to Bifrost Helm chart values, schema, and helpers by @BearTS in #4693
• feat: add directionSelectionEnabled, routeSelectionEnabled, rerouteFailedDirections, and pruneFailedFallbacks flags to bifrost.loadBalancer by @BearTS in #4696
• chore: bump bifrost Helm chart to version 2.1.25 by @BearTS in #4694
• Docs update by @akshaydeo in #4705
• refactor: split Okta SSO docs into separate OIDC and SCIM pages with updated screenshots by @BearTS in #4681
• feat: restructure Keycloak docs into nested OIDC page with updated screenshots and redirect by @BearTS in #4688
• docs: add enterprise Secret Management docs (AWS, GCP, HashiCorp Vault) with vault.<path> reference support and flush-cache API endpoint by @BearTS in #4707
• k8s deployment docs update with notice for namespace by @akshaydeo in #4717
• docs: update ent-v1.5.0 changelog to reflect Secret Manager integration and Generic OIDC Provider instead of SecretVar/EnvVar by @BearTS in #4728
• docs: add Auth0, Generic OIDC, and SCIM docs; restructure Entra, Zitadel, and Google Workspace into nested OIDC/SCIM pages with updated screenshots and redirects by @BearTS in #4729
• fix: bedrock usage calculation by @TejasGhatte in #4760
• feat: anthropic code execution tool support by @TejasGhatte in #4727
• tests: code execution by @TejasGhatte in #4757
• fix: use parseAsSafeArrayOf for logs page array query params to handle special characters in URLs by @impoiler in #4761
• feat: add TruncatedLabel component with tooltip on overflow by @impoiler in #4762
• refactor: extract TruncatedLabel component and replace inline truncation logic by @impoiler in #4763
• fix: rebuild token_usage from denormalized columns in hybrid log list by @impoiler in #4764
• refactor: replace createGovernanceConfigInStore with empty-snapshot mergeGovernanceConfig path for first config file import by @BearTS in #4769
• docs: add Kafka connector observability docs with configuration reference, security, filtering, and trace payload format by @BearTS in #4771
• perf: batch pricing upserts with UpsertModelPricesBatch to reduce round-trips during sync by @Pratham-Mishra04 in #4782
• v1.6.1 changelog by @akshaydeo in #4781
• migration test fixes by @akshaydeo in #4787

Full Changelog: ent-v1.5.0-base...ent-v1.5.1-base