Fix broken code examples in docs (#3869)

* Fix broken code examples in docs

- Tag error output blocks as ```text instead of ```python (anthropic,
  openai integration docs + v2 mirrors)
- Quote unquoted URL in Descope config example (+ v2 mirror)
- Fix GoogleGenAISamplingHandler → GoogleGenaiSamplingHandler casing
  in sampling docs
- Fix import path: handlers.GoogleGenaiSamplingHandler →
  handlers.google_genai.GoogleGenaiSamplingHandler in v3-features

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Fix remaining broken doc examples and add skip tags for false positives

- BearerTokenAuth → StaticTokenVerifier in deployment/http.mdx
- providers.oauth → server.auth import in authentication.mdx
- ListToolsNext → updated list_tools API in v3-features.mdx
- OAuthClientProvider → OAuth in v2/storage-backends.mdx
- Add test="skip" for upgrade guides, contrib placeholders, f-string backticks

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Ratchet doc example baselines to zero

All 1444 examples now pass syntax and import checks.

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Add pytest-examples dev dep, fix client_id in StaticTokenVerifier example, commit missed openapi fixes

- Add pytest-examples to dev dependencies (fixes CI ModuleNotFoundError)
- Include required client_id in StaticTokenVerifier token payload
- Commit previously unstaged HTTPRoute import fixes in openapi.mdx

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

* Update deprecated import paths across docs

- fastmcp.server.openapi → fastmcp.server.providers.openapi
- fastmcp.server.proxy → fastmcp.server.providers.proxy
- fastmcp.server.apps → fastmcp.apps
- Tag upgrade guide "Before" examples with test="skip"

🤖 Generated with Claude Code

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/getting-started/upgrading/from-fastmcp-2.mdx

@@ -264,7 +264,7 @@ auth = GitHubProvider(
 
 The deprecated WebSocket client transport has been removed. Use `StreamableHttpTransport` instead:
 
-```python
+```python test="skip"
 # Before
 from fastmcp.client.transports import WSTransport
 transport = WSTransport("ws://localhost:8000/ws")
@@ -357,7 +357,7 @@ main.mount(subserver)
 
 The proxy and OpenAPI modules have moved under `providers` to reflect v3's provider-based architecture:
 
-```python
+```python test="skip"
 # Deprecated
 from fastmcp.server.proxy import FastMCPProxy
 from fastmcp.server.openapi import FastMCPOpenAPI
@@ -369,7 +369,7 @@ from fastmcp.server.providers.openapi import OpenAPIProvider
 
 `FastMCPOpenAPI` itself is deprecated — use `FastMCP` with an `OpenAPIProvider` instead:
 
-```python
+```python test="skip"
 # Deprecated
 from fastmcp.server.openapi import FastMCPOpenAPI
 server = FastMCPOpenAPI(spec, client)
@@ -408,7 +408,7 @@ proxy = create_proxy("http://example.com/mcp")
 
 The experimental OpenAPI parser is now standard. Update imports:
 
-```python
+```python test="skip"
 # Before
 from fastmcp.experimental.server.openapi import FastMCPOpenAPI