Add unit tests for Router configuration and transport layers

- Implemented tests for RouterConfig, RoutingOptions, StaticInstanceConfig, and RouterConfigOptions to ensure default values are set correctly.
- Added tests for RouterConfigProvider to validate configurations and ensure defaults are returned when no file is specified.
- Created tests for ConfigValidationResult to check success and error scenarios.
- Developed tests for ServiceCollectionExtensions to verify service registration for RouterConfig.
- Introduced UdpTransportTests to validate serialization, connection, request-response, and error handling in UDP transport.
- Added scripts for signing authority gaps and hashing DevPortal SDK snippets.

docs/db/tasks/PHASE_7_FOLLOWUPS.md

@@ -0,0 +1,9 @@
+# Post-Conversion Follow-ups (Optional)
+
+| # | Item | Status | Owner | Notes |
+|---|------|--------|-------|-------|
+| 1 | Approve and adopt issuer Postgres schema | DONE | Issuer Directory Guild | Approved and adopted; IssuerDirectory migration planned for next release. |
+| 2 | Approve and adopt shared audit schema | DONE | Platform Guild | Approved; shared audit schema available for modules that opt in. |
+| 3 | Partitioning plan for high-volume tables (vuln/vex) | DONE | Data/DBA | Evaluated; current volumes below threshold. Revisit when `vex.graph_nodes` > 10M or `vuln.advisory_affected` > 5M. |
+| 4 | Performance baselines & tuning post-cutover | DONE | Module owners | Baselines collected; no critical regressions. Keep EXPLAIN snapshots quarterly. |
+| 5 | Delete residual Mongo assets (code/config) if any | DONE | Module owners | Reviewed; no residual references found. |