fix(gnodev): rewrite lazy loading proxy as HTTP reverse proxy

[jaekwon]

Summary

• Rewrote the gnodev lazy loading proxy (PathInterceptor) from a TCP-level proxy to an HTTP reverse proxy using httputil.ReverseProxy
• The old TCP proxy maintained a persistent connection to the node's RPC server. When a PathHandler triggered a node reload (stop + restart), that connection died, causing the query that triggered the reload to silently fail — breaking the
  core dev workflow of edit → query → see results
• With the HTTP reverse proxy, each request gets a fresh connection. The handler runs synchronously before forwarding, so after a reload the request naturally connects to the new node
• Disabled keep-alive on the transport to prevent stale pooled connections after restarts
• Added TestProxyRestart which validates that queries succeed even when the handler stops and restarts the node mid-request

Test plan

• All 6 existing proxy tests pass unchanged (query interception, tx interception, websocket, passthrough)
• New TestProxyRestart reproduces the exact bug scenario — handler stops the node and starts a new one during request processing, verifies the query still returns a valid response
• go build ./... compiles cleanly with no API changes to consumers (app.go)
• Manual testing: run gnodev with --lazy-loader, navigate to a realm in gnoweb, verify it loads without needing to press 'R'

[Gno2D2]

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[codecov]

Codecov Report

❌ Patch coverage is 59.61538% with 21 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
contribs/gnodev/pkg/proxy/path_interceptor.go	59.61%	17 Missing and 4 partials ⚠️

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