perf(build): faster Maven + UI + CI pipelines

- Maven: enable useIncrementalCompilation; Surefire forkCount=1C +
  reuseForks=true so unit-test JVMs are reused per CPU core instead of
  spawning per class (205 tests pass under the new strategy).
- Testcontainers: opt-in reuse via .withReuse(true) on Postgres +
  ClickHouse base; per-developer enable via ~/.testcontainers.properties.
- UI: drop redundant `tsc --noEmit` from `npm run build` (Vite already
  type-checks); split into a dedicated `npm run typecheck` script.
- CI: cache ~/.npm and ui/node_modules/.vite alongside Maven; npm ci with
  --prefer-offline --no-audit --fund=false; paths-ignore for docs-only,
  .planning/ and .claude/ changes so doc-only pushes skip the pipeline.
- Docs: CLAUDE.md + .claude/rules/cicd.md updated with the new build
  knobs and the Testcontainers reuse opt-in.

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

cameleer-server-app/pom.xml

@@ -189,8 +189,8 @@
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-surefire-plugin</artifactId>
                 <configuration>
-                    <forkCount>1</forkCount>
-                    <reuseForks>false</reuseForks>
+                    <forkCount>1C</forkCount>
+                    <reuseForks>true</reuseForks>
                 </configuration>
             </plugin>
             <plugin>

cameleer-server-app/src/test/java/com/cameleer/server/app/AbstractPostgresIT.java

@@ -21,10 +21,12 @@ public abstract class AbstractPostgresIT {
         postgres = new PostgreSQLContainer<>("postgres:16")
                 .withDatabaseName("cameleer")
                 .withUsername("cameleer")
-                .withPassword("test");
+                .withPassword("test")
+                .withReuse(true);
         postgres.start();
 
-        clickhouse = new ClickHouseContainer("clickhouse/clickhouse-server:24.12");
+        clickhouse = new ClickHouseContainer("clickhouse/clickhouse-server:24.12")
+                .withReuse(true);
         clickhouse.start();
     }