**feat(runtime): add payload configuration support for executors**

Introduce `PayloadConfig` in the configuration to define default and override rules for modifying payload parameters. Implement `applyPayloadConfig` and `applyPayloadConfigWithRoot` to apply these rules across various executors, ensuring consistent parameter handling for different models and protocols. Update all relevant executors to utilize this functionality.

config.example.yaml

@@ -98,3 +98,17 @@ ws-auth: false
 #    models: # The models supported by the provider.
 #      - name: "moonshotai/kimi-k2:free" # The actual model name.
 #        alias: "kimi-k2" # The alias used in the API.
+
+#payload: # Optional payload configuration
+#  default: # Default rules only set parameters when they are missing in the payload.
+#    - models:
+#        - name: "gemini-2.5-pro" # Supports wildcards (e.g., "gemini-*")
+#          protocol: "gemini" # restricts the rule to a specific protocol, options: openai, gemini, claude, codex
+#      params: # JSON path (gjson/sjson syntax) -> value
+#        "generationConfig.thinkingConfig.thinkingBudget": 32768
+#  override: # Override rules always set parameters, overwriting any existing values.
+#    - models:
+#        - name: "gpt-*" # Supports wildcards (e.g., "gpt-*")
+#          protocol: "codex" # restricts the rule to a specific protocol, options: openai, gemini, claude, codex
+#      params: # JSON path (gjson/sjson syntax) -> value
+#        "reasoning.effort": "high"