chore(terminal): remove migrated terminal code

[mlhiter]

Summary

Remove the migrated Terminal frontend and controller implementation from the monorepo, including its charts, CRD, assets, and dependency entries. Update frontend/controller build, module detection, installation, app catalog, and admission whitelist references so CI and deployment no longer target deleted paths.

Validation

Passed frozen pnpm lockfile installation, controllers/go.work parsing, git diff --check, and frontend workflow YAML parsing. No repository-wide automated test command was found; scripts/detect-build-modules.sh requires Bash 4+ and cannot be syntax-checked by macOS Bash 3.2.

Sequence Diagram

sequenceDiagram
    participant Root as Root configuration
    participant FrontendCI as Frontend CI
    participant ControllerCI as Controller module detection
    participant Repo as Repository paths
    Root->>FrontendCI: Evaluate changed files and build matrix
    Root->>ControllerCI: Resolve controller modules
    FrontendCI->>Repo: Build existing frontend targets
    ControllerCI->>Repo: Build existing controller targets
    Repo-->>FrontendCI: Terminal target absent from build path
    Repo-->>ControllerCI: Terminal module absent from module path

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