feat(blocks): Add OpenAI's new opensource models (#10559)

This adds the latest opensource models from OpenAI to the platform, we
are using openrouter to provide api access to it!

I added 
- openai/gpt-oss-20b
- openai/gpt-oss-120b

### Changes 🏗️

<!-- Concisely describe all of the changes made in this pull request:
-->

### Checklist 📋

#### For code changes:
- [x] I have clearly listed my changes in the PR description
- [x] I have made a test plan
- [x] I have tested my changes according to the test plan:
  <!-- Put your test plan here: -->
- [x] Test both of the latest models from openai, openai/gpt-oss-20b and
openai/gpt-oss-120b and they should work!

autogpt_platform/backend/backend/blocks/llm.py

@@ -115,6 +115,8 @@ class LlmModel(str, Enum, metaclass=LlmModelMeta):
     OLLAMA_LLAMA3_405B = "llama3.1:405b"
     OLLAMA_DOLPHIN = "dolphin-mistral:latest"
     # OpenRouter models
+    OPENAI_GPT_OSS_120B = "openai/gpt-oss-120b"
+    OPENAI_GPT_OSS_20B = "openai/gpt-oss-20b"
     GEMINI_FLASH_1_5 = "google/gemini-flash-1.5"
     GEMINI_2_5_PRO = "google/gemini-2.5-pro-preview-03-25"
     GEMINI_2_5_FLASH = "google/gemini-2.5-flash"
@@ -246,6 +248,8 @@ MODEL_METADATA = {
     LlmModel.NOUSRESEARCH_HERMES_3_LLAMA_3_1_70B: ModelMetadata(
         "open_router", 12288, 12288
     ),
+    LlmModel.OPENAI_GPT_OSS_120B: ModelMetadata("open_router", 131072, 131072),
+    LlmModel.OPENAI_GPT_OSS_20B: ModelMetadata("open_router", 131072, 32768),
     LlmModel.AMAZON_NOVA_LITE_V1: ModelMetadata("open_router", 300000, 5120),
     LlmModel.AMAZON_NOVA_MICRO_V1: ModelMetadata("open_router", 128000, 5120),
     LlmModel.AMAZON_NOVA_PRO_V1: ModelMetadata("open_router", 300000, 5120),

autogpt_platform/backend/backend/data/block_cost_config.py

@@ -76,6 +76,8 @@ MODEL_COST: dict[LlmModel, int] = {
     LlmModel.OLLAMA_LLAMA3_405B: 1,
     LlmModel.DEEPSEEK_LLAMA_70B: 1,  # ? / ?
     LlmModel.OLLAMA_DOLPHIN: 1,
+    LlmModel.OPENAI_GPT_OSS_120B: 1,
+    LlmModel.OPENAI_GPT_OSS_20B: 1,
     LlmModel.GEMINI_FLASH_1_5: 1,
     LlmModel.GEMINI_2_5_PRO: 4,
     LlmModel.MISTRAL_NEMO: 1,