Rename project to apocapoc-api

Update module name and all imports from habit-tracker-api to apocapoc-api.
This reflects the project's new branding as part of the apocapoc ecosystem
(apocapoc-api, apocapoc-web, apocapoc-android).

.gitignore

@@ -3,7 +3,7 @@ data/
 *.db
 *.db-shm
 *.db-wal
-habit-tracker-api
+apocapoc-api
 dist/
 bin/
 .internal-notes/