refactor: comprehensive code quality, security, and release readiness improvements

Security: tighten CORS defaults, add webhook rate limiting, fix XSS in
automations, guard WebSocket JSON.parse, validate ADB address input,
seal debug exception leak, URL-encode WS tokens, CSS.escape in selectors.

Code quality: add Pydantic models for brightness/power endpoints, fix
thread safety and name uniqueness in DeviceStore, immutable update
pattern, split 6 oversized files into 16 focused modules, enable
TypeScript strictNullChecks (741→102 errors), type state variables,
add dom-utils helper, migrate 3 modules from inline onclick to event
delegation, ProcessorDependencies dataclass.

Performance: async store saves, health endpoint log level, command
palette debounce, optimized entity-events comparison, fix service
worker precache list.

Testing: expand from 45 to 293 passing tests — add store tests (141),
route tests (25), core logic tests (42), E2E flow tests (33), organize
into tests/api/, tests/storage/, tests/core/, tests/e2e/.

DevOps: CI test pipeline, pre-commit config, Dockerfile multi-stage
build with non-root user and health check, docker-compose improvements,
version bump to 0.2.0.

Docs: rewrite CLAUDE.md (202→56 lines), server/CLAUDE.md (212→76),
create contexts/server-operations.md, fix .js→.ts references, fix env
var prefix in README, rewrite INSTALLATION.md, add CONTRIBUTING.md and
.env.example.

server/src/wled_controller/api/__init__.py

@@ -3,12 +3,16 @@
 from fastapi import APIRouter
 
 from .routes.system import router as system_router
+from .routes.backup import router as backup_router
+from .routes.system_settings import router as system_settings_router
 from .routes.devices import router as devices_router
 from .routes.templates import router as templates_router
 from .routes.postprocessing import router as postprocessing_router
 from .routes.picture_sources import router as picture_sources_router
 from .routes.pattern_templates import router as pattern_templates_router
 from .routes.output_targets import router as output_targets_router
+from .routes.output_targets_control import router as output_targets_control_router
+from .routes.output_targets_keycolors import router as output_targets_keycolors_router
 from .routes.color_strip_sources import router as color_strip_sources_router
 from .routes.audio import router as audio_router
 from .routes.audio_sources import router as audio_sources_router
@@ -22,6 +26,8 @@ from .routes.color_strip_processing import router as cspt_router
 
 router = APIRouter()
 router.include_router(system_router)
+router.include_router(backup_router)
+router.include_router(system_settings_router)
 router.include_router(devices_router)
 router.include_router(templates_router)
 router.include_router(postprocessing_router)
@@ -33,6 +39,8 @@ router.include_router(audio_sources_router)
 router.include_router(audio_templates_router)
 router.include_router(value_sources_router)
 router.include_router(output_targets_router)
+router.include_router(output_targets_control_router)
+router.include_router(output_targets_keycolors_router)
 router.include_router(automations_router)
 router.include_router(scene_presets_router)
 router.include_router(webhooks_router)