feat(tools): add web_search_tool for internet search

Add native web search capability that works regardless of LLM tool-calling
support. This is particularly useful for GLM models via Z.AI that don't
reliably support standard tool calling formats.

Features:
- DuckDuckGo provider (free, no API key required)
- Brave Search provider (optional, requires API key)
- Configurable max results and timeout
- Enabled by default

Configuration (config.toml):
  [web_search]
  enabled = true
  provider = "duckduckgo"
  max_results = 5

The tool allows agents to search the web for current information without
requiring proper tool calling support from the LLM.

Also includes CI workflow fix for first-interaction action inputs.

src/config/mod.rs

@@ -9,7 +9,9 @@ pub use schema::{
     LarkConfig, MatrixConfig, MemoryConfig, ModelRouteConfig, ObservabilityConfig,
     PeripheralBoardConfig, PeripheralsConfig, QueryClassificationConfig, ReliabilityConfig,
     ResourceLimitsConfig, RuntimeConfig, SandboxBackend, SandboxConfig, SchedulerConfig,
-    SecretsConfig, SecurityConfig, SlackConfig, TelegramConfig, TunnelConfig, WebhookConfig,
+    WebSearchConfig, WebhookConfig,
+    SecretsConfig, SecurityConfig, SlackConfig, TelegramConfig, TunnelConfig, WebSearchConfig,
+    WebhookConfig,
 };
 
 #[cfg(test)]