feat: add Claude Opus 4.5 model support

Add Claude Opus 4.5 (20251101) to MAX_TOKENS configuration with 200k token limit for Vertex AI, Anthropic, and Bedrock providers.

Author: syarihu

pr_agent/algo/__init__.py

@@ -64,6 +64,7 @@
     'vertex_ai/claude-3-sonnet@20240229': 100000,
     'vertex_ai/claude-3-opus@20240229': 100000,
     'vertex_ai/claude-opus-4@20250514': 200000,
+    'vertex_ai/claude-opus-4-5@20251101': 200000,
     'vertex_ai/claude-3-5-sonnet@20240620': 100000,
     'vertex_ai/claude-3-5-sonnet-v2@20241022': 100000,
     'vertex_ai/claude-3-7-sonnet@20250219': 200000,
@@ -97,6 +98,7 @@
     'anthropic.claude-v2': 100000,
     'anthropic/claude-3-opus-20240229': 100000,
     'anthropic/claude-opus-4-20250514': 200000,
+    'anthropic/claude-opus-4-5-20251101': 200000,
     'anthropic/claude-3-5-sonnet-20240620': 100000,
     'anthropic/claude-3-5-sonnet-20241022': 100000,
     'anthropic/claude-3-7-sonnet-20250219': 200000,
@@ -109,6 +111,7 @@
     'bedrock/anthropic.claude-v2:1': 100000,
     'bedrock/anthropic.claude-3-sonnet-20240229-v1:0': 100000,
     'bedrock/anthropic.claude-opus-4-20250514-v1:0': 200000,
+    'bedrock/anthropic.claude-opus-4-5-20251101-v1:0': 200000,
     'bedrock/anthropic.claude-3-haiku-20240307-v1:0': 100000,
     'bedrock/anthropic.claude-3-5-haiku-20241022-v1:0': 100000,
     'bedrock/anthropic.claude-3-5-sonnet-20240620-v1:0': 100000,