feat(java): trace Spring/MyBatis enterprise flow end-to-end (#389) (#468)

Closes three gaps that broke `trace(controller, mapper-xml)` on real Spring +
MyBatis projects:

1. **Field-injected concrete-bean trace.** Java `this.<field>.method()` is
   unwrapped at extraction (was surfaced as `this.<field>.method` and dropped
   through every name-matcher strategy). The receiver name is then looked up
   in the enclosing class's field declarations to get the declared type and
   resolve the method on it. Closes the controller→bean hop when the field
   name doesn't capitalize to the type (`userbo` → `UserBO`). General Java
   fix, not Spring-specific.

2. **MyBatis XML mapper as a first-class language.** New extractor parses
   `<mapper namespace="..."><select|insert|update|delete|sql id="X">` and
   emits method-shaped nodes qualified as `<namespace>::<id>`, plus
   `<include refid="X"/>` references to `<sql>` fragments. Non-mapper XML
   (pom, log4j, web.xml) → file node only. A new synthesizer
   (`mybatisJavaXmlEdges`) joins Java mapper methods to XML statements by
   suffix-matching qualified names. Ambiguous simple-name collisions dropped
   for precision.

3. **Spring `@Value`/`@ConfigurationProperties` → application config.**
   `application.{yml,yaml,properties}` + profile variants parse on the
   framework path; each leaf key becomes a `constant` node qualified by its
   dotted path. `@Value("${k}")` / `@Value("${k:default}")` and
   `@ConfigurationProperties(prefix="X")` emit binding nodes that resolve
   with Spring's relaxed binding (kebab↔camel↔snake).

Validated on macrozheng/mall-tiny: full chain
`UmsRoleController.listResource → UmsRoleService.listResource → impl →
UmsResourceMapper.getResourceListByRoleId → XML <select>` connects across 5
hops via static + synthesized edges. 11/11 @Value annotations resolved
(incl. `@ConfigurationProperties(prefix="secure.ignored")`); 6/6 custom-SQL
mapper methods bridge to XML.

Tests: 4 new integration tests in frameworks-integration.test.ts. Full
suite: 1005 passed.

Docs: CHANGELOG `[Unreleased]` entry + dynamic-dispatch-coverage-playbook
narrative + matrix row.

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/extraction/grammars.ts

@@ -10,7 +10,7 @@ import * as path from 'path';
 import { Parser, Language as WasmLanguage } from 'web-tree-sitter';
 import { Language } from '../types';
 
-export type GrammarLanguage = Exclude<Language, 'svelte' | 'vue' | 'liquid' | 'yaml' | 'twig' | 'unknown'>;
+export type GrammarLanguage = Exclude<Language, 'svelte' | 'vue' | 'liquid' | 'yaml' | 'twig' | 'xml' | 'properties' | 'unknown'>;
 
 /**
  * WASM filename map — maps each language to its .wasm grammar file
@@ -95,6 +95,13 @@ export const EXTENSION_MAP: Record<string, Language> = {
   '.luau': 'luau',
   '.m': 'objc',
   '.mm': 'objc',
+  // XML: file-level tracking; the MyBatis extractor matches `<mapper namespace="...">`
+  // shape and emits SQL-statement nodes (other XML returns empty).
+  '.xml': 'xml',
+  // Spring config: `application.properties` / `application-*.properties`. Same
+  // shape as the `.yml` variants — the YAML/properties extractor emits one node
+  // per leaf key, and the Spring resolver links `@Value("${k}")` references.
+  '.properties': 'properties',
 };
 
 /**
@@ -267,6 +274,8 @@ export function isLanguageSupported(language: Language): boolean {
   if (language === 'liquid') return true; // custom regex extractor
   if (language === 'yaml') return true; // file-level tracking only; Drupal routing extraction via framework resolver
   if (language === 'twig') return true; // file-level tracking only
+  if (language === 'xml') return true; // MyBatis mapper extractor
+  if (language === 'properties') return true; // Spring config keys
   if (language === 'unknown') return false;
   return language in WASM_GRAMMAR_FILES;
 }
@@ -277,6 +286,7 @@ export function isLanguageSupported(language: Language): boolean {
 export function isGrammarLoaded(language: Language): boolean {
   if (language === 'svelte' || language === 'vue' || language === 'liquid') return true;
   if (language === 'yaml' || language === 'twig') return true; // no WASM grammar needed
+  if (language === 'xml' || language === 'properties') return true; // no WASM grammar needed
   return languageCache.has(language);
 }
 
@@ -357,6 +367,8 @@ export function getLanguageDisplayName(language: Language): string {
     objc: 'Objective-C',
     yaml: 'YAML',
     twig: 'Twig',
+    xml: 'XML',
+    properties: 'Java properties',
     unknown: 'Unknown',
   };
   return names[language] || language;