Add repository traffic/insights tools (views, clones, referrers, paths)

Beginne damit, die vorhandenen Tools im repos-Toolset und die angepinnten go-github-Methoden ListTrafficViews, ListTrafficClones, ListTrafficReferrers und ListTrafficPaths zu lesen. Füge die vier schreibgeschützten Tools mit den angegebenen Parametern und der Anforderung eines Repository-Scope hinzu und überprüfe anschließend, dass views und clones Aufschlüsselungen nach Tag oder Woche akzeptieren, referrers und paths jedoch nicht.

Describe the feature or problem you'd like to solve

The server has no way to read a repository's traffic/insights data. There are no tools wrapping the four traffic endpoints:

Today an agent can read stars and forks but has no view into whether a repo is actually being visited or cloned, which is the primary signal for measuring adoption and reach of a project. This is a read-only capability.

Proposed solution

Add the four tools above under the existing repos toolset, each ReadOnlyHint: true.

The implementation is thin because the pinned go-github client already exposes all four methods (RepositoriesService.ListTrafficViews, ListTrafficClones, ListTrafficReferrers, ListTrafficPaths), so no new HTTP plumbing is needed. The views/clones tools take an optional per parameter (day | week) mapping to TrafficBreakdownOptions; referrers/paths take just owner/repo.

One note on access: GitHub gates these endpoints behind push access to the repo (for GitHub Apps, the repository Administration: Read permission), so the tools should be annotated to require the repo scope rather than treated as public-read, even though the endpoints exist on public repos.

I'm happy to open a PR for this if the capability is something you'd accept.

Example prompts or workflows (for tools/toolsets only)

1. "How many unique visitors and clones did owner/repo get in the last two weeks?"
2. "Where is traffic to my repo coming from? Show me the top referrers."
3. "Which pages/paths in owner/repo are people actually viewing?"
4. "Compare views vs. clones week over week for owner/repo and tell me if adoption is trending up."
5. "Build me a weekly adoption report for my repo: stars, forks, views, unique visitors, and clones." (traffic is the missing piece today; stars/forks are already covered)

Additional context

Traffic data has a 14-day rolling retention window on GitHub's side, so these tools are especially useful to agents that snapshot the data on a schedule for longer-term trend tracking.