Enhance risk API documentation and error handling

- Updated API documentation for risk endpoints to include optional caching headers and error catalog references.
- Added a new error catalog JSON file to standardize error responses.
- Improved explainability documentation with sample outputs for console and CLI.
- Added SHA256 checksums for new sample files related to explainability.
- Refined AocGuard tests to utilize a helper method for generating test JSON, improving readability and maintainability.
- Updated runbook references to ensure consistency in sprint documentation.
- Introduced stub implementations for MongoDB storage interfaces and options, laying groundwork for future development.
- Disabled analytics in Angular CLI configuration for privacy considerations.

docs/risk/samples/api/SHA256SUMS

@@ -1,2 +1,3 @@
 9408221415b389f6dad1c235de160e88721555b406ab0e2bdbfa3119c6696a4d  README.md
+00f8dc4e466eb95c06545e6336d7b0866b53ac430335b7fd1b7889da13529b93  error-catalog.json
 96926cd81dfb6ff02d62d1fde5d7b2b7b5b3950e50eb651e51b8ae3042ac9506  risk-api-samples.json

docs/risk/samples/api/error-catalog.json

@@ -0,0 +1,13 @@
+{
+  "errors": [
+    {"code": "risk.job.not_found", "message": "Risk job not found", "http_status": 404, "remediation": "Verify job_id"},
+    {"code": "risk.profile.invalid_signature", "message": "Profile DSSE signature failed", "http_status": 400, "remediation": "Re-sign profile and retry"},
+    {"code": "risk.job.rate_limited", "message": "Rate limit exceeded", "http_status": 429, "remediation": "Retry after backoff", "retry_after": 5},
+    {"code": "risk.tenant.scope_denied", "message": "Tenant scope not authorized", "http_status": 403, "remediation": "Provide required scope header"}
+  ],
+  "headers": {
+    "etag": "\"risk-api-sample-etag\"",
+    "x-ratelimit-remaining": 99,
+    "retry-after": 5
+  }
+}