docs: adds workspace-invites feature and tasks

docs/TASKS/workspace-invites/002-invite-email-delivery.md

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+# Task: Invite Email Delivery
+
+## Goal
+
+Send invited users an acceptance link when a workspace invite is created or resent.
+
+## Feature Spec
+
+- `docs/FEATURES/workspace-invites.md`
+
+## Scope
+
+- Generate acceptance URLs from configured website options.
+- Send an invite email after successful invite creation.
+- Add a manager-only resend endpoint for pending, unexpired invites.
+- Avoid sending email if invite creation fails.
+- Do not include sensitive token values in logs.
+
+## Constraints
+
+- Use the repository email infrastructure.
+- Do not introduce a new email provider.
+- Keep email copy concise and product-specific.
+
+## Likely Files
+
+- `backend/src/Socialize.Api/Modules/Workspaces/Handlers/CreateWorkspaceInvite.cs`
+- `backend/src/Socialize.Api/Modules/Workspaces/Handlers/ResendWorkspaceInvite.cs`
+- `backend/src/Socialize.Api/Infrastructure/Emailer/`
+- `backend/src/Socialize.Api/Infrastructure/Configuration/WebsiteOptions.cs`
+
+## Validation
+
+```bash
+dotnet build backend/Socialize.slnx
+dotnet test backend/Socialize.slnx
+```