Add config options for OAuth callback hostname and port (CEA-122)

[cyrusagent]

Summary

• Add OAUTH_CALLBACK_BASE_URL environment variable (defaults to 'http://localhost:3457')
• Replace hardcoded localhost:3457 references with configurable base URL
• Fixes issue where OAuth callback URL was hardcoded and couldn't be customized for different environments
• Provides full flexibility without assuming port format

Changes

• Modified apps/cli/app.ts to use OAUTH_CALLBACK_BASE_URL environment variable
• Updated OAuth URL construction, console output, and HTML templates to use configurable base URL
• Maintains backward compatibility with existing defaults
• Allows users to specify complete URLs with or without ports

Test plan

• Test with default values (should work exactly as before)
• Test with custom OAUTH_CALLBACK_BASE_URL=https://my-domain.com
• Test with custom OAUTH_CALLBACK_BASE_URL=http://my-host:8080
• Verify OAuth flow completes successfully with custom values
• Check that console output and HTML templates show correct URLs

Usage

# Examples of different base URL configurations:
export OAUTH_CALLBACK_BASE_URL=https://my-domain.com
# OAuth callback will use: https://my-domain.com/callback

export OAUTH_CALLBACK_BASE_URL=http://my-host:8080  
# OAuth callback will use: http://my-host:8080/callback

# Default (no env var set):
# OAuth callback will use: http://localhost:3457/callback

This approach provides maximum flexibility - users can specify the complete base URL (with or without port, HTTP or HTTPS) and the system simply appends /callback to it.

Closes CEA-122

🤖 Generated with Claude Code

[jakeleventhal]

@Connoropolous before this merges... i dont know if you want this set in global env. is there not a config file to load this into? OAUTH_CALLBACK_BASE_URL is also super generic for globla env and may clash with other projects/services etc

prefer if theres a .cyrus file or something where you configure this type of thing

[Connoropolous]

gotcha… there is a --env-file=path option now I think, to specify that's how you want env vars loaded. I can also tweak the namespace of those env vars a bit 👍