⭐feat: Add Steam account linking with team creation (#274)

## Description
<!-- Briefly describe the purpose and scope of your changes -->


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **New Features**
- Introduced a real-time Steam login flow using QR codes and server-sent
events (SSE) for team creation and authentication.
- Added Steam account and friend management, including secure credential
storage and friend list synchronization.
- Integrated Steam login endpoints into the API, enabling QR code-based
login and automated team setup.

- **Improvements**
- Enhanced data security by implementing encrypted storage for sensitive
tokens.
- Updated database schema to support Steam accounts, teams, memberships,
and social connections.
- Refined type definitions and consolidated account-related information
for improved consistency.

- **Bug Fixes**
  - Fixed trade ban status representation for Steam accounts.

- **Chores**
- Removed legacy C# Steam authentication service and related
configuration files.
  - Updated and cleaned up package dependencies and development tooling.
  - Streamlined type declaration files and resource definitions.

- **Style**
- Redesigned the team creation page UI with a modern, animated QR code
login interface.

- **Documentation**
  - Updated OpenAPI documentation for new Steam login endpoints.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

sst-env.d.ts

@@ -32,10 +32,6 @@ declare module "sst" {
       "type": "sst.aws.Aurora"
       "username": string
     }
-    "DatabaseMigrator": {
-      "name": string
-      "type": "sst.aws.Function"
-    }
     "DiscordClientID": {
       "type": "sst.sst.Secret"
       "value": string
@@ -90,6 +86,10 @@ declare module "sst" {
       "endpoint": string
       "type": "sst.aws.Realtime"
     }
+    "SteamEncryptionKey": {
+      "type": "random.index/randomString.RandomString"
+      "value": string
+    }
     "Storage": {
       "name": string
       "type": "sst.aws.Bucket"
@@ -107,10 +107,6 @@ declare module "sst" {
       "type": "sst.aws.Service"
       "url": string
     }
-    "ZeroPermissions": {
-      "name": string
-      "type": "sst.aws.Function"
-    }
   }
 }