Fix: Set default DB_URL to pgvector connection in init

[ldemesla]

Summary

Set default DB_URL to the pgvector connection string during initialization, eliminating the need for users to manually enter the database URL.

Changes

• Modified init_cli_config() in init.py to default DB_URL to postgresql://postgres:postgres@localhost:54320/codeindexerdb
• This matches the pgvector container that gets automatically set up during the init process
• Users can still override by entering a custom value when prompted, but now have a working default

Problem Solved

Previously, users had to manually enter the database URL during deadend init, even though the pgvector container was automatically set up with a known connection string. This was confusing and led to potential connection errors if users left it blank or entered incorrect values.

Test plan

• Run deadend init and verify DB_URL defaults to pgvector connection string
• Press Enter to accept default and verify configuration is saved correctly
• Code formatted with black and isort
• Verify the application starts and connects to the database successfully

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