feat(info): show driver docs URL in dbc info

[djfrancesco]

Closes #499

Summary

dbc docs already uses the docs_url from the registry index, but dbc info never showed it. This PR adds it to both the plaintext and the JSON output.

In plaintext, there's a new Docs: line after Description:. It only shows up when the driver has a docs URL:

$ dbc info snowflake
Driver: snowflake
Version: 1.14.0
Title: ASF Snowflake Driver
License: Apache-2.0
Description: An ADBC driver for Snowflake developed under the Apache Software Foundation
Docs: https://adbc-drivers.org/drivers/snowflake/
Available Packages:
   - linux_amd64
   ...

With --json, the driver.info payload gets a docs_url field:

{"schema_version":1,"kind":"driver.info","payload":{"driver":"snowflake", ..., "description":"...","docs_url":"https://adbc-drivers.org/drivers/snowflake/","packages":[...]}}

A few choices I made

I went with Docs: as the label since it's short and matches dbc docs. Drivers without a docs URL get no line at all, so their output doesn't change.

In the JSON, docs_url is always there (empty string when unset). I left out omitempty on purpose, so it behaves like title, license and description right next to it. The field is new, so schema_version stays at 1.

Easy to change any of these if you'd prefer something else.

The tests reuse the existing test-driver-docs-url fixture, and also check that a driver without a docs URL gets no Docs: line and an empty docs_url.

Not in this PR

dbc search -v --json doesn't include docs_url either. I can do that in a follow-up if you want it.

Test plan

• go test ./... passes with Go 1.26.8 (env and user levels)
• New tests fail without the change and pass with it
• go vet ./... clean; changed files are gofmt-clean
• Manual: dbc info snowflake and dbc info snowflake --json against the default registry show the docs URL

[amoeba]

This looks great. Just two small changes.

Thanks for taking the time to contribute here!

[amoeba]

What do you think about using Hyperlink here? Many modern/popular terminals have auto-detection and don't need OSC8 control codes to make hyperlinks clickable but for (1) users who turn auto-detection off or (2) use terminals that don't support OSC8 control codes, this is slightly better. It looks like I missed doing this to the URL in dbc docs so we could do a follow-up PR to fix that.

I also think we should use the full word "Documentation" here. I take your point about using "Docs" to which matches the subcommand but the other fields here don't abbreviate.

Suggested change

	b.WriteString(bold.Render("Docs: ") + drv.DocsURL + "\n")
	b.WriteString(bold.Render("Documentation: ") + lipgloss.NewStyle().Hyperlink(drv.DocsURL).Underline(true).Render(drv.DocsURL) + "\n")

[djfrancesco]

Thank you so much for your time @amoeba !
I agree with the full word "Documentation" instead of "Docs". No need for shortening...
About OSC 8, I didn't know about it but I like everything that can be done in the terminal.
Both changes are in b6a1ca7: Documentation: as the label, and the URL rendered with Hyperlink + underline. I had to add the charm.land/lipgloss/v2 import to info.go for it to build. Piped output is still plain text, since lipgloss.Println strips the escape codes.
I'd be happy to do the dbc docs follow-up too.

[amoeba]

Suggested change

	suite.NotContains(out, "Docs:")
	suite.NotContains(out, "Documentation:")

[djfrancesco]

b6a1ca7