Add marketing workflow tools + OpenPaths routing and update subscription pricing/UI

[lee101]

Motivation

• Provide a set of marketing growth tools backed by an OpenAI-compatible routed endpoint so outputs can be compared across models and combined into actionable reports.
• Surface a nicer checkout/subscription UI and reduce recurring prices while wiring backend price IDs for Stripe integration.
• Add client-side tooling and templates to let users run workflows directly from the tools catalog.

Description

• Added OpenPaths integration in main.py with OPENPATHS_API_BASE, OPENPATHS_API_KEY, OPENPATHS_ROUTER_MODELS, call_openpaths_chat, and the MarketingWorkflowRequest model to call an OpenAI-compatible /chat/completions endpoint and handle errors.
• Implemented a new API endpoint POST /api/tools/marketing-workflow in main.py that accepts a workflow key, runs the configured prompt instructions, routes to configured models, and returns per-model analyses plus combined markdown.
• Registered four new tools in questions/tool_fixtures.py and added a shared Jinja2 template static/templates/tools/marketing-workflow-tool.jinja2 and client script static/js/marketing-workflow-tool.js to power the tool UI and interactions.
• Updated subscription and checkout flows by introducing MONTHLY_SUBSCRIPTION_PRICE_ID and ANNUAL_SUBSCRIPTION_PRICE_ID in main.py and replacing inline price IDs with these constants in checkout creation code.
• Revamped checkout/subscription UI assets by updating static/js/checkout-dialog.js, static/js/subscription-modal.js, and static/js/unlimited-ai-modal.js to show the new prices ($9.99 monthly, $99.99 annual), add an offer chooser/credits panel, and expose showCheckoutDialog; added complementary CSS in static/css/checkout-dialog.css and a new tool template and index entries for the new tools.
• Adjusted templates (static/templates/ai-text-editor.jinja2, shared index and subscribe templates) and tests to reflect pricing and UI changes.

Testing

• Ran the test suite with pytest covering modified and new tests tests/test_checkout_session.py, test_subscription_system.py, tests/unit/test_growth_tools_catalog.py, and tests/unit/test_pricing_configuration.py and confirmed all tests passed.
• Verified unit checks validate presence of new MONTHLY_SUBSCRIPTION_PRICE_ID and ANNUAL_SUBSCRIPTION_PRICE_ID in main.py and updated pricing strings in frontend JS files via the added tests.
• Exercised the new marketing workflow endpoint flow via unit-level assertions that the tool fixtures and template references exist (covered by tests/unit/test_growth_tools_catalog.py).

---

Codex Task

[lee101]

Codex Infinity
Hi! I'm Codex Infinity, your coding agent for this repo.

Start a task on this PR's branch by commenting:

• @codeggsinfinity review
• @codeggsinfinity fix the failing tests
• /codex

Tasks and logs: https://codex-infinity.com