feat(ext-validation): add request validation with compiled constraints

Standard jakarta.validation annotations, compiled once per type into a flat
check table. No configuration: constraints come from the annotations already on
your types, and ValidationException extends HttpException with status 422 so
the default handler renders it without this extension registering anything.

    record CreateUser(@NotBlank @Size(max = 80) String name,
                      @Email String email,
                      @Min(18) int age) {}

    CreateUser dto = validation.body(req, CreateUser.class);

Annotations only — Hibernate Validator's engine is deliberately absent. It
resolves constraints reflectively per call and pulls ~2 MB plus EL, which is
the per-request cost this module exists to avoid. jakarta.validation-api is
~90 KB of annotations.

The passing path allocates nothing. Constraints resolve at first use into an
opcode plus operands cached in a ClassValue, so there is no map lookup and no
lock. Fields are read through MethodHandles adapted to an exact signature —
(Object)Object for references, (Object)long for primitive integrals — so
invokeExact neither boxes nor builds the argument array Field.get and
Method.invoke allocate. Checks are a flat array walked by a tableswitch rather
than a class hierarchy behind a virtual call. @Size reads a length the object
already knows and @Email scans with indexOf, because Pattern.matcher allocates
a matcher and two int arrays per call. Messages are pre-rendered at compile
time. The violation list and the exception exist only once something fails.

@Pattern is the marked exception: its regex compiles once but matcher()
allocates per call.

Constraints are read from declared fields, so records and plain classes take
one code path — a constraint on a record component propagates to its backing
field.

Jakarta null semantics are exact: only @NotNull rejects null.

flash-ext-openapi now mirrors the same annotations into the generated schema —
minLength, maxLength, minItems, minimum, maximum, pattern, format: email and
required — via an optional jakarta.validation dependency detected at boot. A
type declares its rules once and both the validator and the published contract
read them. An explicit @Schema still wins; the bridge only fills keys nobody
set, and without the annotations on the classpath the bridge class is never
loaded.

flash-ext-jackson is optional too: validate(value) works without it, only
body(req, type) needs a codec.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

pom.xml

@@ -38,6 +38,7 @@
         <maven.versions.plugin.version>2.18.0</maven.versions.plugin.version>
         <jmh.version>1.37</jmh.version>
         <junit.version>5.11.0</junit.version>
+        <jakarta.validation.version>3.1.1</jakarta.validation.version>
         <build.helper.plugin.version>3.6.0</build.helper.plugin.version>
     </properties>
 
@@ -67,6 +68,16 @@
                 <artifactId>flash-testing</artifactId>
                 <version>${project.version}</version>
             </dependency>
+            <dependency>
+                <groupId>dev.relism</groupId>
+                <artifactId>flash-ext-validation</artifactId>
+                <version>${project.version}</version>
+            </dependency>
+            <dependency>
+                <groupId>jakarta.validation</groupId>
+                <artifactId>jakarta.validation-api</artifactId>
+                <version>${jakarta.validation.version}</version>
+            </dependency>
             <dependency>
                 <groupId>dev.relism</groupId>
                 <artifactId>flash-ext-jackson</artifactId>