Chore: GenAI hygiene and Spring->GenAI read timeout

[DoPri]

What does this PR do?

Cleanup around the GenAI service plus one cross-service timeout fix. No behaviour change to the AI endpoints themselves.

• Dockerfile cleanup. Dropped the three declared-but-unused build args (RELEASE_TYPE, APP_VERSION, IMAGE_TAG), the commented-out # ENTRYPOINT ["sleep", "600"] debug line, and the duplicate WORKDIR /app. Also pinned both base images by digest (ghcr.io/astral-sh/uv:python3.14-alpine and python:3.14-alpine), which is what the client and Spring Dockerfiles already do.
• pyproject dedupe + version. dependencies listed uvicorn, pydantic, and langchain-openai twice; removed the duplicates. Bumped the version from 5.0.0 to 6.0.0 so genai lines up with the Spring services (also updated app/main.py's SERVICE_VERSION, which feeds the FastAPI version and the application_version metric, and the alexandria-genai entry in uv.lock).
• Spring to GenAI read timeout. Both GenAiClients (knowledgebase- and qa-service) used a 30s read timeout, but the GenAI chat budget is LLM_TIMEOUT_SECONDS=60 with 2 retries, i.e. up to 180s worst case. So Spring could abandon a long-document request at 30s while GenAI kept working (and spending tokens) on something nobody was waiting for. Raised the read timeout to 200s so it sits above GenAI's worst case, rather than shortening GenAI, so the long-document requests the system is built for don't get cut off mid-flight.

Type of change

• Bug fix
• New feature
• Refactor / cleanup
• Docs
• CI / infra

Definition of Done

• CI is green
• If the API changed: api/openapi.yaml is updated and lint passes
• If a service was added or restructured: docker-compose still comes up cleanly (docker compose up)
• Tests added or updated for the changed behaviour
• Docs updated where it matters (README, ADRs, comments)

Notes for the reviewer

• On the timeout: 200s covers the chat model's worst case (60s x 3). The qa /ask path does an embedding call plus the chat call, so in a pathological double-worst-case (both maxing out their retries) it could exceed 200s, but that only happens if GenAI is already badly degraded. If you'd rather cap the total instead, the alternative was shortening GenAI's own budget; I went with raising Spring per our discussion.

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📥 Commits

Reviewing files that changed from the base of the PR and between e76d670 and 43449f9.

⛔ Files ignored due to path filters (1)

• services/genai/uv.lock is excluded by !**/*.lock

📒 Files selected for processing (5)

• services/genai/Dockerfile
• services/genai/app/main.py
• services/genai/pyproject.toml
• services/spring/knowledgebase-service/src/main/java/com/alexandria/knowledgebase/integration/GenAiClient.java
• services/spring/qa-service/src/main/java/com/alexandria/qa/integration/GenAiClient.java

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• Commit unit tests in branch chore/genai-hygiene

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[ladu-tu]

Good catch regarding the Spring timeout!