feat: add submodel provider

[OPAI-OP]

Add SubModel free models.

This is the preview in README.md after run the update script.

SubModel: Fetching SubModel models...
SubModel: Fetched 10 models from SubMoel
SubModel: Found 7 free models from SubModel

SubModel InstaGen APIs

Model Name	Model Limits
DeepSeek V3 0324	1000000 tokens/day 200 requests/day
deepseek-ai/deepseek-r1-0528	1000000 tokens/day 200 requests/day
openai/gpt-oss-120b	1000000 tokens/day 200 requests/day
qwen/qwen3-235b-a22b-instruct-2507	1000000 tokens/day 200 requests/day
qwen/qwen3-235b-a22b-thinking-2507	1000000 tokens/day 200 requests/day
tngtech/deepseek-tng-r1t2-chimera	1000000 tokens/day 200 requests/day
zai-org/glm-4.5-fp8	1000000 tokens/day 200 requests/day

---

@cheahjs Reminder to review and merge this PR. thank you.

[gemini-code-assist]

Summary of Changes

Hello @OPAI-OP, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces support for a new model provider, SubModel, by integrating its API to fetch available models and display their free quota information. This expands the range of models presented to users.

Highlights

• New SubModel Integration: Introduced a new function fetch_submodel_models in src/pull_available_models.py to retrieve available models from the SubModel API, specifically filtering for models with free quotas.
• Main Function Integration: The main function in src/pull_available_models.py has been updated to include fetching models from SubModel, either concurrently or sequentially, alongside existing model providers.
• UI Display Update: A new section for "SubModel InstaGen APIs" has been added to the generated markdown output, displaying the fetched SubModel models and their associated free usage limits.

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[gemini-code-assist]

Code Review

This pull request introduces a new provider, SubModel, for fetching available LLM models. The changes are well-integrated, but I've found a critical bug in the new markdown generation logic that would cause the script to crash. I've provided a fix for this, which also corrects the logic for displaying model limits and fixes a potentially broken URL. I also noted a minor typo in a log message.