fix: ensure tracing headers forwarded on all server-side API requests

[thostetler]

Server-side API requests were silently dropping distributed tracing
headers (X-Original-Uri, X-Original-Forwarded-For, X-Forwarded-For,
X-Amzn-Trace-Id). The root cause: Ramda's pick() does exact key
matching, but Node.js IncomingMessage.headers lowercases all keys
while TRACING_HEADERS uses mixed case -- so pick() always returned {}.

• Added pickTracingHeaders utility for case-insensitive extraction from Node.js IncomingHttpHeaders
• Added pickTracingHeadersEdge utility for Edge Runtime Headers, refactored initSession.ts to use it
• Fixed absCanonicalization.ts search fetch (the originally reported gap)
• Fixed serverside bootstrap.ts to forward tracing headers
• Replaced broken pick(TRACING_HEADERS, ...) in fetchSearchSSR and resolveObjectQuerySSR
• Added tracing headers to verifyMiddleware and middleware link_gateway analytics fetch

[codecov]

Codecov Report

❌ Patch coverage is 97.10145% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 61.6%. Comparing base (968d8a6) to head (9a1e8d6).

Files with missing lines	Patch %	Lines
src/api/objects/objects.ts	50.0%	1 Missing ⚠️
src/api/search/search.ts	66.7%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master    #802     +/-   ##
========================================
+ Coverage    61.6%   61.6%   +0.1%     
========================================
  Files         312     314      +2     
  Lines       36000   36090     +90     
  Branches     1594    1603      +9     
========================================
+ Hits        22148   22225     +77     
- Misses      13815   13828     +13     
  Partials       37      37             

Files with missing lines	Coverage Δ
src/config.ts	100.0% <100.0%> (ø)
src/lib/serverside/absCanonicalization.ts	64.1% <100.0%> (+1.0%)	⬆️
src/lib/serverside/bootstrap.ts	76.1% <100.0%> (ø)
src/middleware.ts	91.9% <100.0%> (+0.1%)	⬆️
src/middlewares/initSession.ts	91.2% <100.0%> (-0.2%)	⬇️
src/middlewares/verifyMiddleware.ts	92.2% <100.0%> (+0.4%)	⬆️
src/utils/tracing.edge.ts	100.0% <100.0%> (ø)
src/api/objects/objects.ts	31.2% <50.0%> (-0.5%)	⬇️
src/api/search/search.ts	45.2% <66.7%> (ø)

... and 1 file with indirect coverage changes

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