feat: add --timeout/-t flag for initialization timeout

[natsirtguy]

Adds a configurable --timeout / -t flag for MCP server initialization timeout.

Default is 30 seconds. Useful when connecting to slow-starting servers.

Changes

• Added FlagTimeout/FlagTimeoutShort constants and InitTimeout variable in root.go
• Added timeout flag parsing in utils.go and call.go
• Used in CreateClientFunc() for initialization timeout
• Added unit tests

Usage

mcp call --timeout 60 ...  # 60 second timeout
mcp call -t 10 ...         # 10 second timeout

[natsirtguy]

Fixed lint issues introduced by this PR (gofmt formatting, empty-block).

Note: The golangci-lint CI check was already failing on main/master before this PR (see run 19383105784). This PR actually reduces the total issue count from 11 to 8 by fixing formatting issues in files I touched.

The remaining 8 issues are pre-existing in the codebase (goconst in web.go, gocritic in new.go, gocyclo in call.go, gofmt in transport_test.go, revive in test_helpers.go).

[natsirtguy]

I rebased onto the commit that fixes the pre-existing linting issues, so should be good to go now.

I also changed the default back to 10 seconds to maintain behavior.

[guangshuqi]

@natsirtguy can we merge this?

[natsirtguy]

@natsirtguy can we merge this?

I don't know why recheck merge status isn't working. I'll try to figure this out tomorrow.