feat(marketing): project-branded drafts + project badges on the X/video queues (#570)

Item B+C of the video/X per-project targeting spec, plus the
company_goals.company_name field they depend on (migration 075).

- CompanyGoalsService.resolve_product_name is the single fallback chain
  (project name -> charter company_name -> RoboCo); XEngine and
  VideoEngine both call it and their prompt builders are pure functions
  taking product_name — release posts/videos stop hardcoding RoboCo.
- The X and video queue responses carry project_slug/project_name via one
  shared unloaded-guard helper (api/schemas/project_fields.py); both
  panel queues render a shared ProjectBadge so multi-project drafts are
  tellable apart.
- Business -> Goals editor gains the company-name input.
- Fixes a pre-existing test-isolation leak: the company-goals routes test
  commits the charter singleton into the session-scoped test DB and
  polluted later suites; it now deletes the row on teardown.

Co-authored-by: Renn F <rennf93@users.noreply.github.com>

alembic/versions/075_company_goals_company_name.py

@@ -0,0 +1,32 @@
+"""Add company_goals.company_name — brands X/video drafting prompts.
+
+CEO-authored product/company name (mirrors ``brand_voice``, migration 061):
+feeds ``XEngine``/``VideoEngine``'s product-name resolution as the fallback
+below a project's own name and above the "RoboCo" literal default. Additive
+and inert until the CEO sets it in the Business -> Goals editor.
+
+Revision ID: 075_company_goals_company_name
+Revises: 074_telegram_credentials
+Create Date: 2026-07-18
+"""
+
+from __future__ import annotations
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "075_company_goals_company_name"
+down_revision = "074_telegram_credentials"
+branch_labels: dict[str, str] | None = None
+depends_on: dict[str, str] | None = None
+
+
+def upgrade() -> None:
+    op.add_column(
+        "company_goals",
+        sa.Column("company_name", sa.Text(), nullable=False, server_default=""),
+    )
+
+
+def downgrade() -> None:
+    op.drop_column("company_goals", "company_name")