Fix: AttributeError: 'HttpUrl' object has no attribute 'partition' in Ollama Client

[marufaytekin]

Why are these changes needed?

Related issue number

Closes #1405

Checks

• I've included any doc changes needed for https://docs.ag2.ai/. See https://docs.ag2.ai/docs/contributor-guide/documentation to build and test documentation locally.
• I've added tests (if relevant) corresponding to the changes introduced in this PR.
• I've made sure all auto checks have passed.

[marklysze]

Thanks for fixing @marufaytekin!

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
autogen/oai/ollama.py	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (2e211d1) and HEAD (9a1a513). Click for more details.

HEAD has 1163 uploads less than BASE

Flag	BASE (2e211d1)	HEAD (9a1a513)
core-without-llm	14	1
3.9	74	0
ubuntu-latest	118	1
macos-latest	104	0
commsagent-discord	9	0
optional-deps	141	0
3.11	48	1
3.13	84	0
browser-use	3	0
3.10	94	0
windows-latest	114	0
commsagent-telegram	9	0
jupyter-executor	9	0
3.12	36	0
commsagent-slack	9	0
retrievechat-mongodb	10	0
interop-crewai	9	0
retrievechat-pgvector	10	0
interop-pydantic-ai	9	0
interop	9	0
crawl4ai	9	0
websockets	9	0
twilio	9	0
graph-rag-falkor-db	6	0
retrievechat	15	0
docs	6	0
interop-langchain	9	0
retrievechat-qdrant	14	0
gpt-assistant-agent	3	0
agent-eval	1	0
teachable	3	0
gemini	14	0
llama-index-agent	3	0
websurfer	15	0
lmm	3	0
long-context	3	0
retrievechat-couchbase	3	0
anthropic	15	0
cerebras	14	0
mistral	14	0
swarm	14	0
together	14	0
groq	14	0
cohere	15	0
ollama	14	0
bedrock	14	0

Files with missing lines	Coverage Δ
autogen/oai/ollama.py	16.15% <0.00%> (-0.69%)	⬇️

... and 46 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.