Rename project from dhamps-vdb to embapi

[Copilot]

Project renamed from "dhamps-vdb" to "embapi" throughout the codebase.

Changes

Go Module & Code

• Module path: github.com/mpilhlt/dhamps-vdb → github.com/mpilhlt/embapi
• All import statements updated
• Field names: VDBKey → EmbAPIKey, vdb_key → embapi_key

API Breaking Change

// Old response
{"user_handle": "alice", "vdb_key": "abc123..."}

// New response  
{"user_handle": "alice", "embapi_key": "abc123..."}

Docker

• Binary: dhamps-vdb → embapi
• Service: dhamps-vdb → embapi
• Containers: dhamps-vdb → embapi, dhamps-postgres → embapi-postgres
• Network: dhamps-network → embapi-network
• Database: dhamps_vdb → embapi, dhamps_user → embapi_user

Documentation

• Hugo baseURL: https://mpilhlt.github.io/embapi/
• README, all doc files, examples updated
• GitHub workflows updated to build embapi binary

Configuration Files

• OpenAPI spec, docker-compose.yml, DOCKER.md
• Environment templates, SQL migrations
• GitHub Actions workflows

Original prompt

The project, repository and software has been renamed from "dhamps-vdb" to "embapi". Change this everywhere.

• go module path
• README and documentation
• hugo configuration (github pages website now resides at https://mpilhlt.github.io/embapi/ )
• variable names ("embapi" rather than "vdb", and "EmbAPI" e.g. in "EmbAPIKey" instead of "VDBKey")
• docker configuration and docker image name
• other places I did not think of

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[awagner-mainz]

Looks good.