fix(compiler): align generated apps and typed IR

[cssbruno]

Summary

• generate default .gowdk app packages inside the application module, remove stale nested go.mod files, and keep legacy/role app module isolation where required
• lower server load fields into typed IR and make render, SSR load, taint, and validation paths consume typed fields instead of reparsing ServerBody
• add state-shape compatibility metadata so dev component HMR carries island state only across compatible replacements

Issues

Fixes #663.
Refs #664.
Refs #639.

Verification

• go test ./internal/gwdkir ./internal/gwdkanalysis ./internal/compiler ./internal/viewrender ./internal/buildgen ./internal/appgen ./internal/gowdkcmd (parent go process hung after child exit; packages through appgen passed, gowdkcmd rerun below passed)
• go test ./internal/gowdkcmd -count=1
• go test ./internal/gwdkanalysis ./internal/compiler ./internal/buildgen ./internal/appgen
• go test ./internal/gowdkcmd -run 'TestBuildValidationReturnsOperationErrorDiagnostics|TestDevComponentHMRPayload|TestLiveReloadScriptIncludesComponentHMR|TestBuildCommandGeneratesContractRoleBinaries' -count=1
• go build ./cmd/gowdk
• scripts/test-go-modules.sh
• scripts/check-docs-links.sh
• scripts/check-docs-style.sh
• scripts/check-removed-syntax.sh
• scripts/check-doc-versions.sh
• git diff --check

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Resolve app modules from the generated app directory

When gowdk build --project-root /path/to/app --app /path/to/app/.gowdk/site --bin ... is invoked from any directory other than the project root, this still asks go list -m in the process cwd. The build path does not chdir to ProjectRoot, so .gowdk apps inside the application module fall back to a nested go.mod or use the wrong module; generated backend imports such as example.com/site/internal/... then fail to resolve or trip Go internal visibility, which is the case this change is trying to fix. Resolve the module relative to absApp/project root instead of the current working directory.

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[chatgpt-codex-connector]

Report empty server loads as diagnostics

When a non-empty server {} body has setup/Go lines but no => { ... } load declaration, parseServerFields returns an empty slice and this assignment leaves ServerFields empty without adding a diagnostic. The following invariant check now reports internal compiler error: ... has server body but no typed load fields for a user-authored validation mistake in gowdk check/build --ssr; emit a normal validation diagnostic when no fields are parsed from a non-empty server block instead of letting it become an ICE.

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[chatgpt-codex-connector]

Reject malformed keyed server load fields

For keyed server declarations, everything after the top-level colon is discarded without any validation, so inputs like server { => { title: } } or => { title: missing( } are accepted as a load field named title instead of producing a parse diagnostic. This lets malformed authoring syntax reach SSR generation/checks as if it were valid; either reject colon syntax here or validate that the keyed expression is present and syntactically valid before appending the field name.

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