Add bootstrap admin team and user

[yulmwu]

At server startup, similar to database migration, the creation (bootstrapping) of an Admin team and an admin user has been added. This can be configured using the following options:

# Bootstrap
BOOTSTRAP_ADMIN_TEAM=true
BOOTSTRAP_ADMIN_USER=true
BOOTSTRAP_ADMIN_USERNAME=admin
BOOTSTRAP_ADMIN_EMAIL=
BOOTSTRAP_ADMIN_PASSWORD=

All values default to true. If BOOTSTRAP_ADMIN_EMAIL or BOOTSTRAP_ADMIN_PASSWORD is empty, the admin user will not be created, and only the Admin team will be created. The team name is fixed as Admin.

Additionally, the following configuration has been added to the dummy SQL generator script:

bootstrap:
  use_bootstrap_admin: true

Administrators are now placed exclusively in the Admin team. If the above options are enabled, the admin team and admin user will not be created again.

[Copilot]

Pull request overview

This PR adds bootstrap functionality to automatically create an admin team and admin user at server startup when the database is empty. This feature allows for easier initial setup of CTF instances without requiring manual admin user creation through SQL scripts.

Changes:

• Added bootstrap configuration options (BOOTSTRAP_ADMIN_TEAM, BOOTSTRAP_ADMIN_USER, BOOTSTRAP_ADMIN_USERNAME, BOOTSTRAP_ADMIN_EMAIL, BOOTSTRAP_ADMIN_PASSWORD) with defaults
• Implemented bootstrap logic in Go to create Admin team and admin user on empty database
• Updated dummy SQL generator to support bootstrap mode by commenting out admin team/user creation when enabled

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
cmd/server/bootstrap.go	New file implementing bootstrap logic for admin team and user creation
cmd/server/main.go	Integrates bootstrap function call at server startup
internal/config/config.go	Adds BootstrapConfig struct and loading logic for bootstrap environment variables
internal/config/config_test.go	Adds test coverage for bootstrap config redaction and logging
scripts/generate_dummy_sql/main.py	Adds bootstrap mode support, adjusts user count calculations
scripts/generate_dummy_sql/generator.py	Updates user and registration key generation to support bootstrap mode
scripts/generate_dummy_sql/sql_writer.py	Adds logic to comment out admin team/user SQL in bootstrap mode
scripts/generate_dummy_sql/data_loader.py	Fixes validation logic for user count
scripts/generate_dummy_sql/defaults/settings.yaml	Adds bootstrap configuration with use_bootstrap_admin flag
scripts/generate_dummy_sql/defaults/data.yaml	Unrelated change to stack_target_port
README.md	Documents new bootstrap environment variables (with typo)
.env.example	Adds bootstrap configuration examples

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[codecov]

Codecov Report

❌ Patch coverage is 74.44444% with 23 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
internal/bootstrap/bootstrap.go	72.05%	12 Missing and 7 partials ⚠️
internal/config/config.go	81.81%	2 Missing and 2 partials ⚠️

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