Add Turkish (tr) docs and update README (#744)

* Add Turkish (tr) docs and update README

Add a full set of Turkish documentation under docs/tr (agents, changelog, CLAUDE guide, contributing, code of conduct, and many agents/commands/skills/rules files). Update README to include a link to the Turkish docs and increment the supported language count from 5 to 6. This commit adds localized guidance and references to help Turkish-speaking contributors and users.

* Update docs/tr/TROUBLESHOOTING.md

Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>

* Update docs/tr/README.md

Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>

* docs(tr): fix license link and update readmes

Update Turkish docs: change license badge link to point to repository root (../../LICENSE), increment displayed language count from 5 to 6, and remove two outdated related links from docs/tr/examples/README.md to keep references accurate.

* Update docs/tr/commands/instinct-import.md

Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>

* Update docs/tr/commands/checkpoint.md

Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>

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Co-authored-by: cubic-dev-ai[bot] <191113872+cubic-dev-ai[bot]@users.noreply.github.com>

docs/tr/skills/springboot-tdd/SKILL.md

@@ -0,0 +1,158 @@
+---
+name: springboot-tdd
+description: Test-driven development for Spring Boot using JUnit 5, Mockito, MockMvc, Testcontainers, and JaCoCo. Use when adding features, fixing bugs, or refactoring.
+origin: ECC
+---
+
+# Spring Boot TDD İş Akışı
+
+80%+ kapsam (unit + integration) ile Spring Boot servisleri için TDD rehberi.
+
+## Ne Zaman Kullanılır
+
+- Yeni özellikler veya endpoint'ler
+- Bug düzeltmeleri veya refactoring'ler
+- Veri erişim mantığı veya güvenlik kuralları ekleme
+
+## İş Akışı
+
+1) Önce testleri yazın (başarısız olmalılar)
+2) Geçmek için minimal kod uygulayın
+3) Testleri yeşil tutarken refactor edin
+4) Kapsamı zorlayın (JaCoCo)
+
+## Unit Testler (JUnit 5 + Mockito)
+
+```java
+@ExtendWith(MockitoExtension.class)
+class MarketServiceTest {
+  @Mock MarketRepository repo;
+  @InjectMocks MarketService service;
+
+  @Test
+  void createsMarket() {
+    CreateMarketRequest req = new CreateMarketRequest("name", "desc", Instant.now(), List.of("cat"));
+    when(repo.save(any())).thenAnswer(inv -> inv.getArgument(0));
+
+    Market result = service.create(req);
+
+    assertThat(result.name()).isEqualTo("name");
+    verify(repo).save(any());
+  }
+}
+```
+
+Desenler:
+- Arrange-Act-Assert
+- Kısmi mock'lardan kaçının; açık stubbing tercih edin
+- Varyantlar için `@ParameterizedTest` kullanın
+
+## Web Katmanı Testleri (MockMvc)
+
+```java
+@WebMvcTest(MarketController.class)
+class MarketControllerTest {
+  @Autowired MockMvc mockMvc;
+  @MockBean MarketService marketService;
+
+  @Test
+  void returnsMarkets() throws Exception {
+    when(marketService.list(any())).thenReturn(Page.empty());
+
+    mockMvc.perform(get("/api/markets"))
+        .andExpect(status().isOk())
+        .andExpect(jsonPath("$.content").isArray());
+  }
+}
+```
+
+## Entegrasyon Testleri (SpringBootTest)
+
+```java
+@SpringBootTest
+@AutoConfigureMockMvc
+@ActiveProfiles("test")
+class MarketIntegrationTest {
+  @Autowired MockMvc mockMvc;
+
+  @Test
+  void createsMarket() throws Exception {
+    mockMvc.perform(post("/api/markets")
+        .contentType(MediaType.APPLICATION_JSON)
+        .content("""
+          {"name":"Test","description":"Desc","endDate":"2030-01-01T00:00:00Z","categories":["general"]}
+        """))
+      .andExpect(status().isCreated());
+  }
+}
+```
+
+## Persistence Testleri (DataJpaTest)
+
+```java
+@DataJpaTest
+@AutoConfigureTestDatabase(replace = AutoConfigureTestDatabase.Replace.NONE)
+@Import(TestContainersConfig.class)
+class MarketRepositoryTest {
+  @Autowired MarketRepository repo;
+
+  @Test
+  void savesAndFinds() {
+    MarketEntity entity = new MarketEntity();
+    entity.setName("Test");
+    repo.save(entity);
+
+    Optional<MarketEntity> found = repo.findByName("Test");
+    assertThat(found).isPresent();
+  }
+}
+```
+
+## Testcontainers
+
+- Production'ı yansıtmak için Postgres/Redis için yeniden kullanılabilir container'lar kullanın
+- JDBC URL'lerini Spring context'e enjekte etmek için `@DynamicPropertySource` ile bağlayın
+
+## Kapsam (JaCoCo)
+
+Maven snippet:
+```xml
+<plugin>
+  <groupId>org.jacoco</groupId>
+  <artifactId>jacoco-maven-plugin</artifactId>
+  <version>0.8.14</version>
+  <executions>
+    <execution>
+      <goals><goal>prepare-agent</goal></goals>
+    </execution>
+    <execution>
+      <id>report</id>
+      <phase>verify</phase>
+      <goals><goal>report</goal></goals>
+    </execution>
+  </executions>
+</plugin>
+```
+
+## Assertion'lar
+
+- Okunabilirlik için AssertJ'yi (`assertThat`) tercih edin
+- JSON yanıtları için `jsonPath` kullanın
+- Exception'lar için: `assertThatThrownBy(...)`
+
+## Test Veri Builder'ları
+
+```java
+class MarketBuilder {
+  private String name = "Test";
+  MarketBuilder withName(String name) { this.name = name; return this; }
+  Market build() { return new Market(null, name, MarketStatus.ACTIVE); }
+}
+```
+
+## CI Komutları
+
+- Maven: `mvn -T 4 test` veya `mvn verify`
+- Gradle: `./gradlew test jacocoTestReport`
+
+**Unutmayın**: Testleri hızlı, izole ve deterministik tutun. Uygulama detaylarını değil, davranışı test edin.