feat: build x0 github2stackfield application

[Copilot]

Summary

Full implementation of the github2stackfield x0 application — a modern Bootstrap-styled browser frontend that connects GitHub Issues with Stackfield Tasks via Python backend services built on the python-micro-esb framework.

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Changes

• static/menu.json — 3 navigation links (User Credentials, Issue / Task Mapping, Connect Stackfield Task)
• static/object.json — all x0 UI objects for 3 screens: sysObjectFormfieldList, sysObjectList, sysObjContextMenu, sysObjButton, ServiceConnector
• static/skeleton.json — screen layout wiring objects to screens / connectors
• python/service_implementation.py — GitHubService + StackfieldService subclassing microesb.ClassHandler
• python/user_routing.py — python-micro-esb ServiceRouter routing functions for all 5 backend operations
• python/VerifyGitHubCredentials.py — WSGI endpoint: validate + persist GitHub credentials
• python/VerifyStackfieldCredentials.py — WSGI endpoint: validate + persist Stackfield credentials
• python/SearchGitHubIssues.py — WSGI endpoint: search GitHub issues, return indexed rows for x0 List
• python/GetGitHubIssueDetails.py — WSGI endpoint: fetch full issue data, pre-populate Screen 3 formfields
• python/CreateStackfieldTask.py — WSGI endpoint: create Stackfield task via REST API
• python/POSTData.py + python/StdoutLogger.py — x0 helper modules
• database/01-create-schema.sql — github2sf schema: credentials, app_config, issue_task_mapping tables
• database/02-insert-config.sql — x0 system.config rows for appid=github2sf
• database/03-insert-text.sql — webui.text entries in English and German for all UI labels
• docker/Dockerfile + docker/docker-compose.yml + docker/apache2.conf — containerised deployment
• README.md — full architecture, installation, and usage documentation

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Screen Overview

Screen 1 — User Credentials

Two sysObjectFormfieldList groups (GitHub + Stackfield), each with a Verify credentials button. On success the credentials are stored in the database.

Screen 2 — Issue / Task Mapping

Search sysObjectFormfieldList + search button (fires SearchGitHubIssues event) → ServiceConnector → sysObjectList with sysObjContextMenu entry Connect Stackfield Task (right-click → navigate to Screen 3, fire ConnectStackfieldTask event).

Screen 3 — Connect Stackfield Task

IssueDetailsConnector (ServiceConnector, listens to ConnectStackfieldTask) populates two sysObjectFormfieldList instances:

• GitHub issue properties (read-only: number, state, title, URL)
• Stackfield mapping fields (editable: room ID, task title, description, priority) — pre-populated from the issue data

sysObjButton Create New Stackfield Task calls the backend to POST to Stackfield's task API.

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python-micro-esb integration

GitHubService and StackfieldService both extend microesb.ClassHandler. Each WSGI endpoint constructs a ServiceRouter and calls router.send(routing_function, request_data), dispatching to the appropriate function in user_routing.py.