feat: add validation for sw_url

[Fine0830]

No description provided.

[Copilot]

Pull request overview

Adds centralized SkyWalking OAP URL normalization/validation and enforces it at transport command startup to fail fast on unsupported URL schemes.

Changes:

• Introduces tools.NormalizeOAPURL() to finalize the GraphQL endpoint and validate allowed URL schemes.
• Adds validateConfiguredSkyWalkingURL() and calls it from stdio, sse, and streamable command entrypoints.
• Adds unit tests covering URL normalization and invalid scheme rejection across transports.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
internal/tools/common.go	Adds NormalizeOAPURL wrapper to finalize URL and validate scheme.
internal/tools/common_test.go	Adds tests for NormalizeOAPURL including unsupported scheme coverage.
internal/swmcp/server.go	Uses NormalizeOAPURL for configured URL + adds shared validation helper.
internal/swmcp/stdio.go	Fails fast on invalid configured SkyWalking URL before starting stdio server.
internal/swmcp/sse.go	Fails fast on invalid configured SkyWalking URL before starting SSE server.
internal/swmcp/streamable.go	Fails fast on invalid configured SkyWalking URL before starting Streamable server.
internal/swmcp/server_test.go	Adds tests ensuring invalid schemes are rejected by validation and transport commands.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.