docs: mark PORTFOLIO-001 done, update roadmap

docs/roadmap/done/PORTFOLIO-001-position-entries.yaml

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+id: PORTFOLIO-001
+title: Position-Level Portfolio Entries
+status: backlog
+priority: P0
+size: M
+depends_on: []
+tags: [portfolio, domain-model]
+summary: Evolve from single-quantity portfolio to multi-position entries with individual entry dates and prices.
+acceptance_criteria:
+  - User can add a position entry with underlying type (GLD shares, GC=F contracts, XAU grams/oz)
+  - Each position has its own entry_price, entry_date, quantity
+  - Portfolio page shows list of positions with individual P&L
+  - Portfolio total collateral is sum of all position values in display currency
+  - Backward compatible: existing single-entry portfolios migrate to one position entry
+  - Settings page has "Add Position" and "Remove Position" controls
+  - Position CRUD persists to workspace storage
+notes:
+  - This is foundational for mode switching between GLD/GC=F/physical gold
+  - Entry_date matters for conversion lookups (GLD backing varies by date)
+  - Single-quantity legacy portfolios should auto-migrate to one position
+implementation_hints:
+  - Add `Position` dataclass in `app/models/portfolio.py`
+  - Add `positions: List[Position]` to `PortfolioConfig` (migrate `gold_ounces`/`entry_price` to first position)
+  - Position underlying defaults to "GLD" for backward compat
+  - Entry_date defaults to position creation date if not specified
+  - Storage costs deferred to PORTFOLIO-002