Add camofox-browser integration: gyandoot-browser crate + agent tools

New crate: crates/gyandoot-browser/
  - client.rs: Full REST client for camofox-browser API (health, tabs,
    navigation, snapshots, click/type/scroll, search macros)
  - macros.rs: 14 SearchMacro enum (Google, YouTube, Amazon, Reddit,
    Wikipedia, Twitter, Yelp, Spotify, Netflix, LinkedIn, Instagram,
    TikTok, Twitch) with parse/display
  - snapshot.rs: PageSnapshot, PageLinks, NavigationResult, HealthResponse
  - session.rs: BrowserSession, SessionManager with idle cleanup

New module: crates/gyandoot-agent/src/browser_tools.rs
  - WebSearchTool: Search the web using anti-detection browser
  - WebBrowseTool: Browse URLs, click, type, scroll with element refs
  - register_browser_tools(): Wire both tools into ToolExecutor

CLI: Added
                                 o
                                 |
               - - - - - -     .---.     - - - - - -
          - - - - - - - - -  [ ^   ^ ]  - - - - - - - - -
             - - - - - - -   |  ___  |   - - - - - - -
                              `-----'
           ____ __   __  ___   _   _  ____   ___   ___  _____
          / ___|\ \ / / / _ \ | \ | ||  _ \ / _ \ / _ \|_   _|
         | |  _  \ V / / /_\ \|  \| || | | | | | | | | | | |
         | |_| |  | |  |  _  || |\  || |_| | |_| | |_| | | |
          \____/  |_|  |_| |_||_| \_||____/ \___/ \___/  |_|

        o - - - - - - -  knowledge. delivered. - - - - - - - o

Unknown command: browser
Run 'gyandoot help' for usage. subcommand with health/search/browse actions

Installer: Updated install.sh with camofox-browser cloning, Node.js
detection, npm dependency install, and systemd service setup

Camofox-browser running at http://localhost:9377 (Docker, verified working)

Workspace: 12 crates + CLI binary — cargo check passes with 0 errors.

Cargo.lock

@@ -530,6 +530,7 @@ dependencies = [
  "clap",
  "dirs",
  "gyandoot-agent",
+ "gyandoot-browser",
  "gyandoot-core",
  "gyandoot-gateway",
  "gyandoot-kanban",
@@ -554,6 +555,7 @@ dependencies = [
  "anyhow",
  "async-trait",
  "chrono",
+ "gyandoot-browser",
  "gyandoot-core",
  "gyandoot-memory",
  "gyandoot-providers",
@@ -567,6 +569,22 @@ dependencies = [
  "uuid",
 ]
 
+[[package]]
+name = "gyandoot-browser"
+version = "2.0.0"
+dependencies = [
+ "anyhow",
+ "chrono",
+ "gyandoot-core",
+ "reqwest",
+ "serde",
+ "serde_json",
+ "thiserror",
+ "tokio",
+ "tracing",
+ "uuid",
+]
+
 [[package]]
 name = "gyandoot-core"
 version = "2.0.0"