feat(character): WCL-style Rankings tab — class percentiles, All Stars, parse links

[VortexUK]

Summary

Per-character rankings tab on the character page, modelled on Warcraft Logs (user feature request).

• GET /api/character/{name}/rankings — computed over the /api/rankings kills dataset (shared 60s cache, zero extra load), grouped by (zone, scope).
• Class-scoped percentiles: Best % ranks the character's best parse among every same-class parse on that boss; Med % is the median across their kills.
• All Stars: Points = 100 × best ÷ class record (closeness to the record — deliberately distinct information from the rank-based Best %); Rank = position among same-class characters. Zone header sums points and ranks the total, with peers credited for bosses the target never killed.
• Tab gating: character page fetches the summary eagerly; the tab only exists with ≥1 ranked kill. ?tab=rankings deep links fall back to Equipment for unranked characters.
• Both metrics (dps + hps) in one response — the Damage/Healing toggle never refetches; priests default to Healing.
• WCL percentile colours via the shared percentileColors scale; Boss / Highest / Fastest link to parse pages.
• Dev tooling: scripts/dev/seed_fake_parses.py seeds shaped winning kills against real curated zones.db bosses (--wipe reverses).

Test plan

• 6 backend tests: class-pool isolation, median math, HPS metric, All Stars cross-boss coverage, empty-zones gating, endpoint 200/400.
• 6 frontend tests: table values + WCL colours + parse links, metric toggle, healer default, dash rendering, tab hidden/shown gating.
• Full gates: 1636 backend / 256 frontend tests, ruff + pyright + tsc clean, dist rebuilt.
• Manually verified locally against seeded parses (percentile bands land gold/purple/blue/grey as designed).

🤖 Generated with Claude Code