fix(api): use relative imports to fix build error

[abdotop]

Replaces self-referential @01edu/api imports with relative imports in api/dev.ts and api/doc.ts to fix module graph build error during publish.

[Copilot]

Pull request overview

This PR fixes a module graph build error by replacing self-referential @01edu/api imports with relative imports in internal api/dev.ts and api/doc.ts files. Additionally, the Sql type definition is extracted from db/mod.ts and moved to a new types/db.d.ts file to establish a proper dependency hierarchy.

• Fixed circular dependency issues by using relative imports for internal modules
• Extracted Sql type to @01edu/types/db to avoid module graph conflicts
• Updated all references to import Sql from the new location

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
types/deno.json	Version bump to 0.1.4, added @db/sqlite dependency, and new export for ./db
types/db.d.ts	New type definition file exporting the Sql type
deno.lock	Lock file update to track @db/sqlite dependency for types package
db/mod.ts	Removed Sql type definition and imported it from @01edu/types/db
api/router.ts	Updated Sql import to use @01edu/types/db
api/doc.ts	Replaced self-referential @01edu/api/* imports with relative imports
api/dev.ts	Replaced self-referential @01edu/api/* imports with relative imports

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