builder.AddConnectionString stores single quotes as Unicode escape sequences in user secrets, causing password recognition failure.

### Is there an existing issue for this?

- [x] I have searched the existing issues

### Describe the bug

When using Aspire Dashboard and leaving builder.AddConnectionString without a value, the dashboard prompts for parameter values as described here.
If the entered value contains single quotes ('), it is stored in ~/.microsoft/usersecrets/{UserSecretsId}/secrets.json as \u0027.
This Unicode conversion breaks password recognition because the original single quote is not preserved.
Additionally, the documentation should clarify that values entered through the dashboard prompt are saved to user secrets, as this behavior is not explicitly mentioned.

### Expected Behavior

- Single quotes should not be converted to Unicode escape sequences (\u0027) when saving to secrets.json.
- The original character should remain intact to ensure credentials work as intended.
- Documentation should explicitly state that dashboard-entered values are stored in user secrets.

### Steps To Reproduce

1. In Aspire Dashboard, leave builder.AddConnectionString without a value.
2. When prompted for unresolved parameters, enter a value containing single quotes (e.g., password'123).
3. Check ~/.microsoft/usersecrets/{UserSecretsId}/secrets.json.
4. Observe that the single quote is stored as \u0027, causing authentication issues.

### Exceptions (if any)

_No response_

### .NET Version info

~ ❯ dotnet --info 09:36:18
.NET SDK:
Version: 10.0.100
Commit: b0f34d51fc
Workload version: 10.0.100-manifests.4c0ca8ba
MSBuild version: 18.0.2+b0f34d51f

런타임 환경:
OS Name: Mac OS X
OS Version: 15.6
OS Platform: Darwin
RID: osx-arm64
Base Path: /usr/local/share/dotnet/sdk/10.0.100/

설치된 .NET 워크로드:
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Host:
Version: 10.0.0
Architecture: arm64
Commit: b0f34d51fc

.NET SDKs installed:
9.0.305 [/usr/local/share/dotnet/sdk]
10.0.100 [/usr/local/share/dotnet/sdk]

.NET runtimes installed:
Microsoft.AspNetCore.App 9.0.9 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.AspNetCore.App 10.0.0 [/usr/local/share/dotnet/shared/Microsoft.AspNetCore.App]
Microsoft.NETCore.App 9.0.9 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]
Microsoft.NETCore.App 10.0.0 [/usr/local/share/dotnet/shared/Microsoft.NETCore.App]

Other architectures found:
None

Environment variables:
DOTNET_ROOT [/opt/homebrew/opt/dotnet/libexec]

global.json file:
Not found

Learn more:
https://aka.ms/dotnet/info

Download .NET:
https://aka.ms/dotnet/download

### Anything else?

_No response_