Add Task-6 offline hardening defaults to Z3R4H launcher path

[RadDad87]

Summary

Implemented Task 6 with minimal scope limited to launch_z3r4h.bat and a README note.

Launcher updates (launch_z3r4h.bat)

Added Z3R4H offline/local defaults (launcher path only):

• OFFLINE_MODE=True
• WEBUI_AUTH=False
• ENABLE_LOGIN_FORM=False
• ENABLE_SIGNUP=False
• ENABLE_COMMUNITY_SHARING=False
• ENABLE_WEB_SEARCH=False

Existing local llama.cpp/OpenAI-compatible routing defaults remain unchanged.

README update

Added a minimal note under the Z3R4H launcher section documenting the new offline hardening defaults and their purpose.

Scope constraints honored

• Only launch_z3r4h.bat and README.md were modified.
• No backend code changes.
• No dependencies added.
• No legal/license files touched.

Effect in Z3R4H launcher path

• Disables login/signup flow for local path.
• Disables community-sharing UI surfaces.
• Disables web-search features.
• Reinforces offline mode defaults.

Deferred beyond Task 6

• Deeper removal of cloud/provider settings pages.
• Backend endpoint-level hard blocks.
• Mode-to-model routing and advanced runtime policies.

Commit

• 071c41b8

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Codex Task