Add bilingual manual and localized docs routes

doc/manual/source/language/value/bool.md

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+# Bool
+
+`Bool` is the primitive type constraint for Boolean values.
+
+## Examples
+
+```dcdl
+enable = Bool default true;
+disable = Bool default false;
+```
+
+## Literals
+
+`Bool` accepts the following literals:
+
+```dcdl
+true
+false
+```

doc/manual/source/language/value/float.md

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+# Float
+
+`Float` is the primitive type constraint for floating-point values.
+
+## Examples
+
+```dcdl
+ratio = Float;
+threshold = Float default 0.5;
+```
+
+## Relationship to Int
+
+`Int` and `Float` are distinct primitive type constraints.
+A `Float` constraint requires a concrete `Float`, and an `Int` constraint requires a concrete `Int`.
+
+Arithmetic and comparison expressions can treat `Int` and `Float` as numeric values.
+Mixed arithmetic produces a `Float` result.

doc/manual/source/language/value/index.md

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+# Value
+
+This chapter defines the kinds of values handled by the language.
+
+Primitive types are built-in constraints that values must satisfy, rather than ordinary data values.
+
+```dcdl
+name = String;
+retry = Int default 3;
+ratio = Float;
+enable = Bool default true;
+tags = [...String];
+```
+
+The primitive types are `String`, `Int`, `Float`, and `Bool`.
+`Unknown` is not a primitive type; it is the top abstract range containing every Decodal value. An `Unknown` without a concrete value or default cannot be materialized.
+An array is not a primitive type and is described as `[...T]` with a required element constraint.
+Links to each type specification are collected in the [manual contents](../../index.md).
+
+See [Constraints and Defaults](../constraints-and-defaults.md) for details about primitive types and constraint composition.

doc/manual/source/language/value/int.md

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+# Int
+
+`Int` is the primitive type constraint for integer values.
+
+## Examples
+
+```dcdl
+retry = Int default 3;
+port = Int & >= 1 & <= 65535;
+```
+
+## Constraint composition
+
+`Int` can be composed with numeric comparison constraints.
+
+```dcdl
+NarrowedPort = Int & >= 1 & <= 65535 & > 443;
+```

doc/manual/source/language/value/string.md

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+# String
+
+`String` is the primitive type constraint for string values.
+
+A string literal is enclosed in `"`.
+
+```dcdl
+"hello"
+"line 1\nline 2"
+```
+
+`$`, `{`, and `}` have no special meaning inside a string; Decodal does not perform string interpolation.
+
+## Examples
+
+```dcdl
+name = String;
+greeting = String default "hello";
+```
+
+## Constraint composition
+
+`String` can be composed with string constraints.
+
+```dcdl
+message = String & /Hello! .*/;
+```
+
+Enable regex-constraint validation with the Rust crate's `regex` feature.
+Without that feature, a regex constraint cannot be validated against a concrete string and produces a diagnostic.