Refactor and update test projects, remove obsolete tests, and upgrade dependencies

- Deleted obsolete test files for SchedulerAuditService and SchedulerMongoSessionFactory.
- Removed unused TestDataFactory class.
- Updated project files for Mongo.Tests to remove references to deleted files.
- Upgraded BouncyCastle.Cryptography package to version 2.6.2 across multiple projects.
- Replaced Microsoft.Extensions.Http.Polly with Microsoft.Extensions.Http.Resilience in Zastava.Webhook project.
- Updated NetEscapades.Configuration.Yaml package to version 3.1.0 in Configuration library.
- Upgraded Pkcs11Interop package to version 5.1.2 in Cryptography libraries.
- Refactored Argon2idPasswordHasher to use BouncyCastle for hashing instead of Konscious.
- Updated JsonSchema.Net package to version 7.3.2 in Microservice project.
- Updated global.json to use .NET SDK version 10.0.101.

CLAUDE.md

@@ -41,7 +41,7 @@ dotnet test --filter "FullyQualifiedName~TestMethodName"
 dotnet test src/StellaOps.sln --verbosity normal
 ```
 
-**Note:** Tests use Mongo2Go which requires OpenSSL 1.1 on Linux. Run `scripts/enable-openssl11-shim.sh` before testing if needed.
+**Note:** Integration tests use Testcontainers for PostgreSQL. Ensure Docker is running before executing tests.
 
 ## Linting and Validation
 
@@ -61,10 +61,10 @@ helm lint deploy/helm/stellaops
 ### Technology Stack
 - **Runtime:** .NET 10 (`net10.0`) with latest C# preview features
 - **Frontend:** Angular v17 (in `src/UI/StellaOps.UI`)
-- **Database:** MongoDB (driver version ≥ 3.0)
-- **Testing:** xUnit with Mongo2Go, Moq, Microsoft.AspNetCore.Mvc.Testing
+- **Database:** PostgreSQL (≥16) with per-module schema isolation; see `docs/db/` for specification
+- **Testing:** xUnit with Testcontainers (PostgreSQL), Moq, Microsoft.AspNetCore.Mvc.Testing
 - **Observability:** Structured logging, OpenTelemetry traces
-- **NuGet:** Use the single curated feed and cache at `local-nugets/`
+- **NuGet:** Uses standard NuGet feeds configured in `nuget.config` (dotnet-public, nuget-mirror, nuget.org)
 
 ### Module Structure
 
@@ -89,7 +89,7 @@ The codebase follows a monorepo pattern with modules under `src/`:
 - **Libraries:** `src/<Module>/__Libraries/StellaOps.<Module>.*`
 - **Tests:** `src/<Module>/__Tests/StellaOps.<Module>.*.Tests/`
 - **Plugins:** Follow naming `StellaOps.<Module>.Connector.*` or `StellaOps.<Module>.Plugin.*`
-- **Shared test infrastructure:** `StellaOps.Concelier.Testing` provides MongoDB fixtures
+- **Shared test infrastructure:** `StellaOps.Concelier.Testing` and `StellaOps.Infrastructure.Postgres.Testing` provide PostgreSQL fixtures
 
 ### Naming Conventions
 
@@ -127,7 +127,7 @@ The codebase follows a monorepo pattern with modules under `src/`:
 
 - Module tests: `StellaOps.<Module>.<Component>.Tests`
 - Shared fixtures/harnesses: `StellaOps.<Module>.Testing`
-- Tests use xUnit, Mongo2Go for MongoDB integration tests
+- Tests use xUnit, Testcontainers for PostgreSQL integration tests
 
 ### Documentation Updates
 
@@ -200,6 +200,8 @@ Before coding, confirm required docs are read:
 
 - **Architecture overview:** `docs/07_HIGH_LEVEL_ARCHITECTURE.md`
 - **Module dossiers:** `docs/modules/<module>/architecture.md`
+- **Database specification:** `docs/db/SPECIFICATION.md`
+- **PostgreSQL operations:** `docs/operations/postgresql-guide.md`
 - **API/CLI reference:** `docs/09_API_CLI_REFERENCE.md`
 - **Offline operation:** `docs/24_OFFLINE_KIT.md`
 - **Quickstart:** `docs/10_CONCELIER_CLI_QUICKSTART.md`
@@ -216,5 +218,5 @@ Workflows are in `.gitea/workflows/`. Key workflows:
 ## Environment Variables
 
 - `STELLAOPS_BACKEND_URL` - Backend API URL for CLI
-- `STELLAOPS_TEST_MONGO_URI` - MongoDB connection string for integration tests
+- `STELLAOPS_TEST_POSTGRES_CONNECTION` - PostgreSQL connection string for integration tests
 - `StellaOpsEnableCryptoPro` - Enable GOST crypto support (set to `true` in build)