[meta] Stable 1.0.0 release

Meta issue to track outstanding work towards a stable release.

Must haves

Decoupling embdeddings

• ✨ Make Embeddings Engine Pluggable RTBC
• ✨ Add OpenAI Embeddings Engine Fixed

Decoupling vector backends

• ✨ Add a trait, base class and interface for AI Search API backend engines RTBC
• 📌 Add decouple Milvus support Needs review
• ✨ Add decoupled Postgres + pgvector support Needs review
• 📌 [P1] Update pinecone backend to use new engines & base class Active

Chatbot

Will likely be experimental, but needs to work with swappable embeddings and backends.

• ✨ Decouple the Chatbot and add Fireworks AI support Fixed
• 📌 Absolute source link Needs review

Misc

• ✨ Missing documentation Active
• 📌 Use GitLab CI Fixed

Nice to have

• Tidy up the Chatbot and make it directly usable rather than a proof of concept
• Decide how to handle composer dependencies properly (split modules, always require, documentation).