fix: structured config with create_if_missing for non-existent database

[mikkeldamsgaard]

Summary

• Fixes structured database config failing with create_if_missing: true when the target database does not yet exist (regression from URL-based config). Closes seed: structured database config fails with create_if_missing when target database does not exist (regression from 1.2.0) #50.
• When a create_if_missing phase targets the same database as the structured config name, initium now connects to the driver's default admin database (postgres / mysql) first, creates the target, then reconnects.
• Adds integration tests for structured config edge cases: special-character passwords (URL-reserved chars), PostgreSQL options field, and the create_if_missing regression for both PostgreSQL and MySQL.

Test plan

• All 25 integration tests pass (including 5 new ones)
• All 173 unit tests pass
• cargo clippy, cargo fmt, dprint check clean
• CI passes

docker compose -f tests/docker-compose.yml up -d --wait
INTEGRATION=1 cargo test --test integration_test -- --test-threads=1
docker compose -f tests/docker-compose.yml down

🤖 Generated with Claude Code

[Copilot]

Pull request overview

Fixes a regression in seed when using structured database config with a create_if_missing: true phase targeting the same database as database.name, ensuring initium can create the DB before the initial connection would otherwise fail.

Changes:

• Add a bootstrap connection path for structured configs to create a missing target database before reconnecting to the configured database.
• Add new integration tests covering structured config edge cases (special-character passwords, Postgres options, and the create-if-missing regression for Postgres/MySQL).
• Document the fix and new integration tests in the changelog.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/seed/mod.rs	Adds bootstrap logic to connect to an admin/default database for initial create_if_missing database creation, then reconnects.
tests/integration_test.rs	Adds integration tests for structured-config connection edge cases and the regression scenario from #50.
CHANGELOG.md	Notes the regression fix and new integration tests under Unreleased.

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[Copilot]

Pull request overview

Fixes a regression in initium seed where structured DB configs failed when create_if_missing: true targeted the same (non-existent) database as database.name, by adding a bootstrap connection path and documenting/testing the behavior.

Changes:

• Add database.default_database to structured DB config to control which DB is used for bootstrap during create_if_missing.
• Add bootstrap connection flow in seeding to create the target DB before reconnecting to it.
• Add integration tests covering structured config edge cases (special-character passwords, Postgres options, and the create-if-missing regression) plus schema/docs/changelog updates.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/seed/mod.rs	Adds bootstrap connection logic for structured configs when create_if_missing targets database.name.
src/seed/schema.rs	Extends structured DB config with default_database and adds parsing tests.
tests/integration_test.rs	Adds integration coverage for structured config edge cases and the create-if-missing regression for Postgres/MySQL.
docs/seeding.md	Documents database.default_database and updates the schema reference table.
CHANGELOG.md	Records the new config field, bug fix, and added integration coverage.

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