add SREBOT, SHARED, TSSBOT contents (fixup for #1223)

PR #1223 only staged the deletions of the old paths because the new
top-level directories were still untracked when the commit was authored.
This commit adds the actual restructured tree: SREBOT/ (existing bot),
SHARED/ (vromfs, data_parser, ICONS/MAPS/FONTS, DAGOR_FILES,
update_game_files), and TSSBOT/ (skeleton).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/constants/seasons

@@ -0,0 +1,35 @@
+2026-I
+
+week 1 (01.01 — 07.01) <t:1767225600:R> max BR 14.3
+week 2 (08.01 — 14.01) <t:1767830400:R> max BR 12.0
+week 3 (15.01 — 21.01) <t:1768435200:R> max BR 11.0
+week 4 (22.01 — 28.01) <t:1769040000:R> max BR 10.0
+week 5 (29.01 — 04.02) <t:1769644800:R> max BR 9.0
+week 6 (05.02 — 11.02) <t:1770249600:R> max BR 8.0
+week 7 (12.02 — 18.02) <t:1770854400:R> max BR 7.0
+week 8 (19.02 — 23.02) <t:1771459200:R> max BR 6.0
+until eos (24.02 — 28.02) <t:1771891200:R> max BR 5.0
+
+2026-II
+
+week 1 (01.03 — 08.03) <t:1772348400:R> max BR 14.3
+week 2 (09.03 — 15.03) <t:1773039600:R> max BR 12.0
+week 3 (16.03 — 22.03) <t:1773644400:R> max BR 10.7
+week 4 (23.03 — 29.03) <t:1774249200:R> max BR 9.7
+week 5 (30.03 — 05.04) <t:1774854000:R> max BR 8.7
+week 6 (06.04 — 12.04) <t:1775458800:R> max BR 7.3
+week 7 (13.04 — 19.04) <t:1776063600:R> max BR 6.3
+week 8 (20.04 — 26.04) <t:1776668400:R> max BR 5.7
+until eos (27.04 — 30.04) <t:1777273200:R> max BR 4.7
+
+2026-III
+
+week 1 (01.05 — 07.05) <t:1777618800:R> max BR 14.3
+week 2 (08.05 — 14.05) <t:1778223600:R> max BR 12.0
+week 3 (15.05 — 21.05) <t:1778828400:R> max BR 11.0
+week 4 (22.05 — 28.05) <t:1779433200:R> max BR 10.0
+week 5 (29.05 — 04.06) <t:1780038000:R> max BR 9.0
+week 6 (05.06 — 11.06) <t:1780642800:R> max BR 8.0
+week 7 (12.06 — 18.06) <t:1781247600:R> max BR 7.0
+week 8 (19.06 — 25.06) <t:1781852400:R> max BR 6.0
+until eos (26.06 — 30.06) <t:1782457200:R> max BR 5.0