feat(blocks): Add claude-sonnet-4.5 (#11023)

## Summary
Adds claude-sonnet-4.5 model to the platform and sets the price to 9

### 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 the new claude-sonnet-4.5 model on the platform to make sure
it works

autogpt_platform/backend/backend/blocks/llm.py

@@ -101,6 +101,7 @@ class LlmModel(str, Enum, metaclass=LlmModelMeta):
     CLAUDE_4_1_OPUS = "claude-opus-4-1-20250805"
     CLAUDE_4_OPUS = "claude-opus-4-20250514"
     CLAUDE_4_SONNET = "claude-sonnet-4-20250514"
+    CLAUDE_4_5_SONNET = "claude-sonnet-4-5-20250929"
     CLAUDE_3_7_SONNET = "claude-3-7-sonnet-20250219"
     CLAUDE_3_5_SONNET = "claude-3-5-sonnet-latest"
     CLAUDE_3_5_HAIKU = "claude-3-5-haiku-latest"
@@ -213,6 +214,9 @@ MODEL_METADATA = {
     LlmModel.CLAUDE_4_SONNET: ModelMetadata(
         "anthropic", 200000, 64000
     ),  # claude-4-sonnet-20250514
+    LlmModel.CLAUDE_4_5_SONNET: ModelMetadata(
+        "anthropic", 200000, 64000
+    ),  # claude-sonnet-4-5-20250929
     LlmModel.CLAUDE_3_7_SONNET: ModelMetadata(
         "anthropic", 200000, 64000
     ),  # claude-3-7-sonnet-20250219

autogpt_platform/backend/backend/data/block_cost_config.py

@@ -69,6 +69,7 @@ MODEL_COST: dict[LlmModel, int] = {
     LlmModel.CLAUDE_4_1_OPUS: 21,
     LlmModel.CLAUDE_4_OPUS: 21,
     LlmModel.CLAUDE_4_SONNET: 5,
+    LlmModel.CLAUDE_4_5_SONNET: 9,
     LlmModel.CLAUDE_3_7_SONNET: 5,
     LlmModel.CLAUDE_3_5_SONNET: 4,
     LlmModel.CLAUDE_3_5_HAIKU: 1,  # $0.80 / $4.00