fix(class-metadata): emit type: undefined for ctorParam annotations without a runtime value

Fixes #563.

`setClassMetadata` ctorParams emitted the annotation's name even when the
type has no value-space symbol — interfaces, type aliases, class type
parameters, `import type` bindings — producing a `ReferenceError` when the
metadata thunk evaluates. ngtsc's `typeToValue` (`type_to_value.ts`) marks
these `TypeValueReferenceKind.UNAVAILABLE` and `ctorParameterToMetadata`
emits `LiteralExpr(undefined)`.

OXC compiles single files, matching upstream's `experimental-local`
compilation (the mode the e2e comparison harness uses). In local mode
`typeToValue` resolves only the declaration kinds visible in the file:
`TypeParameter`, `TypeAliasDeclaration`, and `InterfaceDeclaration` are
UNAVAILABLE; everything else emits as written under an upstream
`/* @ts-ignore */` — const enums, vars, functions, bare namespace names,
missing members (`ns.Missing`), even undeclared names. Verified against
real ngtsc 22.2.1 output in local mode for every case.

Reworked `build_param_type_expression` to mirror that flow:

- `T | null` narrows to `T` first (`getConstructorParameters`); the
  narrowed node must be a bare `TSTypeReference` — parenthesized, union,
  `typeof`, `this`, and primitive annotations are UNAVAILABLE
  (previously `resolve_di_token_type` unwrapped them).
- The DI dependency is no longer consulted; upstream derives `type:`
  purely from the annotation.
- A bare class type parameter (`x: T`) is UNAVAILABLE; `T.Inner` emits —
  its member symbol has no type-only declaration.
- `import type` / `import { type X }` are UNAVAILABLE. A bare namespace
  or `import =` alias reference (`x: ns`) is UNAVAILABLE for namespace
  imports but emits for `import =`. `ImportInfo` gained
  `is_default_import` to distinguish `import Foo from 'm'` (emits the
  local name — upstream's LOCAL + `defaultImportStatement`) from
  `import { default as Foo }` (emits `i1.default`, the IMPORTED path).
- New `LocalDecls` records interface/type-alias names and namespace
  bodies recursively (unwrapping `export`, hoisting `declare global`),
  so `ns.Interface` resolves UNAVAILABLE while the merged
  `interface I` + `namespace I` symbol emits — its valueDeclaration is
  the namespace.

Import elision keeps a default import when a decorated constructor's
parameter annotation references it bare — metadata emits the local name,
so eliding the import would leave `type: Foo` dangling.

`StringConsts` gained a `program()` accessor so the metadata builder can
scan the file's declarations.

e2e: the three `ctorParams` metadataDiffs entries in known-differences.ts
are removed — the emitted metadata now matches ngtsc.

Author: Brooooooklyn