Add CLAUDE.md guidance file

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## What this is
+
+`codbex-theia` is a stripped-down distribution of [Eclipse Dirigible](https://github.com/eclipse/dirigible) packaged as a Spring Boot application. Despite the name, it does **not** bundle the Eclipse Theia IDE — it ships only the **Terminal-over-HTTP** standard components (and supporting IDE/git/console UI). The intended use is browser-based shell access into a target environment such as a Kubernetes pod.
+
+The application is essentially a thin assembly layer: nearly all functionality comes from `org.eclipse.dirigible:dirigible-components-*` dependencies declared in `application/pom.xml`. There is very little hand-written Java here — understand the codebase by understanding *which Dirigible components are included* and *how Spring profiles wire them up*, not by reading local source.
+
+### Product scope
+
+codbex-theia is a codbex product (see https://www.codbex.com/products/): a Dirigible-based distribution scoped to a single use case — minimal, terminal-only shell access. It strips the platform down to that, which is why `dirigible.properties` sets `DIRIGIBLE_PRODUCT_TYPE=terminal`. When deciding what belongs in this repo, keep that scope in mind — broader IDE/engine features are out of scope here.
+
+## Module layout
+
+Maven multi-module project under parent `com.codbex.platform:codbex-platform-parent` (the parent defines build profiles, plugin config, and dependency versions — it is external, not in this repo):
+
+- `application/` — the Spring Boot app. `TheiaApplication` is the entry point; it scans `org.eclipse.dirigible` and excludes the default JDBC/JPA autoconfiguration (Dirigible manages datasources itself). Also contains the `Dockerfile`.
+- `branding/` — Dirigible branding resources (logo, favicon, `branding.js`) served under `/services/web/ide-branding/`. Packaged as a jar and consumed by `application`.
+- `integration-tests/` — Selenium/browser-driven integration tests built on `dirigible-tests-framework` / `dirigible-tests-base`. No production code.
+
+## Build & run
+
+All commands run from the repo root. Maven profiles (`quick-build`, `unit-tests`, `integration-tests`, `tests`, `format`) come from the platform parent.
+
+```shell
+mvn -T 1C clean install -P quick-build   # build the jar, skip tests
+mvn clean install -P unit-tests          # unit tests
+mvn clean install -P integration-tests   # integration tests (browser-driven)
+mvn clean install -P tests               # all tests
+mvn verify -P format                     # format the code — run before committing
+```
+
+Run the built jar (note the required `--add-opens` flags — the app will misbehave without them):
+
+```shell
+java --add-opens=java.base/java.lang=ALL-UNNAMED \
+     --add-opens=java.base/java.lang.reflect=ALL-UNNAMED \
+     --add-opens=java.base/java.nio=ALL-UNNAMED \
+     -jar application/target/codbex-theia-*.jar
+```
+
+Docker (build the jar first):
+
+```shell
+cd application && docker build . --tag ghcr.io/codbex/codbex-theia:latest
+docker run --name theia -p 80:80 ghcr.io/codbex/codbex-theia:latest
+```
+
+The Docker image is based on `amazoncorretto:21-alpine` and installs `ttyd`, `nodejs`/`npm`, `esbuild`, `typescript`, and `git` — these are runtime requirements of the terminal and JavaScript engine components.
+
+### Running a single test
+
+Standard Maven, but bind to the right profile so the surrounding config (datasource, etc.) is active:
+
+```shell
+mvn test -P unit-tests -pl application -Dtest=TheiaApplicationTest
+mvn verify -P integration-tests -pl integration-tests -Dit.test=TheiaTerminalIT
+```
+
+## Access
+
+- App: http://localhost:80 — default login `admin` / `admin`
+- Swagger UI: http://localhost/swagger-ui/index.html
+
+## Spring profiles (important)
+
+The app is driven by Spring profiles, not by the small amount of local code. `application.properties` activates `common,app-default` by default. To enable a specific Dirigible security/deployment mode, add its profile explicitly alongside `common` and `app-default`, e.g.:
+
+```
+SPRING_PROFILES_ACTIVE=common,snowflake,app-default
+```
+
+Security backends are pluggable via the included components: `basic` (default), `keycloak`, `cognito`, `snowflake`, `client-registration`. Activate the matching profile to switch.
+
+## Configuration
+
+- `application/src/main/resources/dirigible.properties` — Dirigible product config. Notable: `DIRIGIBLE_MULTI_TENANT_MODE=false`, `DIRIGIBLE_PRODUCT_TYPE=terminal`, `DIRIGIBLE_HOME_URL=services/web/ide-terminal/` (the terminal is the landing page). `${project.version}` / `${git.commit.id}` are filled at build time via resource filtering.
+- `application-app-default.properties` — sets `server.port=80`.
+
+## Conventions
+
+- Java source files carry the EPL-2.0 license header (see any existing `.java` file). New files should reuse it verbatim.
+- This repo is released on a version-bump cadence: commits like "version set to X for release" / "version set to Y-SNAPSHOT for development" are made by the release pipeline (`.github/workflows/release.yaml`) — do not hand-edit versions for normal work.