[Fix] Update stale 72h references in docs/comments + dynamic decimals in ClaimRoyalties

[realproject7]

Problem

PR #180 changed deadline to 168h but left stale references:

1. packages/cli/src/commands/status.ts:135 — comment says "72h from last plot"
2. docs/PROPOSAL-plotlink.md:79 — "Enforces 72h deadline if enabled"
3. docs/ROADMAP.md:211 — "enforces 72h deadline if enabled"
4. docs/ROADMAP.md:278 — "optionally enables the 72h deadline"

Also: ClaimRoyalties.tsx hardcodes 18 for decimals — should use dynamic reserve decimals pattern.

Fix

• Update all 72h → 7-day (168h), "optional" → "mandatory"
• Use dynamic decimals in ClaimRoyalties.tsx (same pattern as PR [#177] Fix reader dashboard: RESERVE_LABEL + truncated decimals #181)