[AZ-189] [AZ-190] [AZ-191] [AZ-192] [AZ-193] [AZ-194] [AZ-195] Add e2e blackbox test suite

Made-with: Cursor

_docs/02_document/modules/common_configs_connection_strings.md

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+# Module: Azaion.Common.Configs.ConnectionStrings
+
+## Purpose
+Configuration POCO for PostgreSQL connection strings, bound from `appsettings.json` section `ConnectionStrings`.
+
+## Public Interface
+
+| Property | Type | Description |
+|----------|------|-------------|
+| `AzaionDb` | `string` | Read-only connection string (used for queries) |
+| `AzaionDbAdmin` | `string` | Admin connection string (used for writes: insert, update, delete) |
+
+## Internal Logic
+None — pure data class.
+
+## Dependencies
+None.
+
+## Consumers
+- `DbFactory` constructor — receives `IOptions<ConnectionStrings>` to build data options
+
+## Data Models
+None.
+
+## Configuration
+Bound via `builder.Configuration.GetSection(nameof(ConnectionStrings))` in `Program.cs`. Expected env vars (from `env/api/env.ps1`):
+- `ASPNETCORE_ConnectionStrings__AzaionDb`
+- `ASPNETCORE_ConnectionStrings__AzaionDbAdmin`
+
+## External Integrations
+None.
+
+## Security
+Contains database credentials at runtime; values must not be logged or exposed.
+
+## Tests
+Hardcoded in `UserServiceTest` (test credentials).